Tag Archives: Impacts

Geology’s human footprint is enough to spur rage

Once again science has presented evidence that a new geological epoch is here. This human footprint is all our own work.

LONDON, 21 October, 2020 − The human footprint has left its mark on Earth, in every sense. The United States alone is scarred by 500,000 abandoned mines and quarries.

Right now, worldwide, there are more than 500,000 active quarries and pits, employing 4 million people, excavating the sand and gravel needed for new roads, new homes and new megacities.

Humans have not simply pitted the face of the Earth, they have paved it. In 1904, beyond the cities, the US had just 225 km of sealed highway. Now it has 4.3m km of asphalt or concrete roadway, consuming more than 20 billion tonnes of sand and gravel.

By comparison, the Great Wall of China, the biggest and most enduring construction in early human history, contains just 0.4bn tonnes of stone.

Humans have changed the face of the waters. In 1950, trawlers, long-liners and purse seiners fished just 1% of the high seas beyond territorial waters. No fish species of any kind was considered over-exploited or depleted.

Extinction threat widens

Less than one human lifetime on, fishing fleets roam 63% of the high seas and 87% of fish species are exploited, over-exploited or in a state of collapse. Meanwhile somewhere between 5m and almost 13 million tons of discarded plastics flow each year into the sea.

Humans and human livestock now far outweigh all other mammalian life. At least 96% of the mass of all mammals is represented by humans and their domesticated animals. Domestic poultry makes up 70% of the mass of all living birds. The natural world is now endangered, with a million species at risk of extinction.

And humans have left an almost indelible radiant signature over the entire global surface: between 1950 and 1980, nations detonated more than 500 thermonuclear weapons to smear the air and surface of the planet with radioactive materials: one of these, plutonium-239, will be detectable for the next 100,000 years.

The catalogue of planetary devastation that is the human footprint is assembled in a new study by US and European scientists in the journal Nature Communications: Earth and Environment. It is part of a fresh attempt to settle a seemingly academic question of geological bureaucracy, the naming of ages.

“We humans collectively got ourselves into this mess, we need to work together to reverse these environmental trends and dig ourselves out of it”

The 11,000-year interval since the end of the last Ice Age and the dawn of agriculture, metal smelting, and the first cities, cultures and empires is still formally identified as the Holocene. The latest study of the human legacy is just another salvo in the campaign to announce and confirm the launch of an entirely new epoch, to be called the Anthropocene.

In fact, environmental campaigners, biologists and geophysicists have for years been informally calling the last six or seven decades the Anthropocene. But the authority with the last word on internationally-agreed geological labels − the International Commission on Stratigraphy − has yet to confirm the launch of the new geological epoch.

To help confirm the case for change, researchers have once again assembled the evidence and identified at least 16 ways in which humans have dramatically altered the planet since 1950, and the beginning of what is sometimes called The Great Acceleration.

For instance, humans have doubled the quantity of fixed nitrogen in the biosphere, created an alarming hole in the stratospheric ozone layer, released enough gases to raise the planetary temperature and precipitate global climate change, fashioned or forged perhaps 180,000 kinds of mineral (by comparison, only about 5,300 occur naturally) and − with dams, drains, wells, irrigation, and hydraulic engineering − effectively replumbed the world’s river systems.

Ineradicable scar

By forging metals and building structures, humans have become the greatest earth-moving force on the planet, and left a mark that will endure for aeons.

Altogether, humans have altered the world’s rivers, lakes, coastlines, vegetation, soils, chemistry and climate. The study makes grim reading.

“This is the first time that humans have documented humanity’s geological footprint on such a comprehensive scale in a single publication,” said Jaia Syvitski, of the University of Colorado, Boulder, who led the research team that assembled the evidence.

“We humans collectively got ourselves into this mess, we need to work together to reverse these environmental trends and dig ourselves out of it.

“Society shouldn’t feel complacent. Few people who read the manuscript should come away without emotions bubbling up, like rage, grief and even fear.” − Climate News Network

Once again science has presented evidence that a new geological epoch is here. This human footprint is all our own work.

LONDON, 21 October, 2020 − The human footprint has left its mark on Earth, in every sense. The United States alone is scarred by 500,000 abandoned mines and quarries.

Right now, worldwide, there are more than 500,000 active quarries and pits, employing 4 million people, excavating the sand and gravel needed for new roads, new homes and new megacities.

Humans have not simply pitted the face of the Earth, they have paved it. In 1904, beyond the cities, the US had just 225 km of sealed highway. Now it has 4.3m km of asphalt or concrete roadway, consuming more than 20 billion tonnes of sand and gravel.

By comparison, the Great Wall of China, the biggest and most enduring construction in early human history, contains just 0.4bn tonnes of stone.

Humans have changed the face of the waters. In 1950, trawlers, long-liners and purse seiners fished just 1% of the high seas beyond territorial waters. No fish species of any kind was considered over-exploited or depleted.

Extinction threat widens

Less than one human lifetime on, fishing fleets roam 63% of the high seas and 87% of fish species are exploited, over-exploited or in a state of collapse. Meanwhile somewhere between 5m and almost 13 million tons of discarded plastics flow each year into the sea.

Humans and human livestock now far outweigh all other mammalian life. At least 96% of the mass of all mammals is represented by humans and their domesticated animals. Domestic poultry makes up 70% of the mass of all living birds. The natural world is now endangered, with a million species at risk of extinction.

And humans have left an almost indelible radiant signature over the entire global surface: between 1950 and 1980, nations detonated more than 500 thermonuclear weapons to smear the air and surface of the planet with radioactive materials: one of these, plutonium-239, will be detectable for the next 100,000 years.

The catalogue of planetary devastation that is the human footprint is assembled in a new study by US and European scientists in the journal Nature Communications: Earth and Environment. It is part of a fresh attempt to settle a seemingly academic question of geological bureaucracy, the naming of ages.

“We humans collectively got ourselves into this mess, we need to work together to reverse these environmental trends and dig ourselves out of it”

The 11,000-year interval since the end of the last Ice Age and the dawn of agriculture, metal smelting, and the first cities, cultures and empires is still formally identified as the Holocene. The latest study of the human legacy is just another salvo in the campaign to announce and confirm the launch of an entirely new epoch, to be called the Anthropocene.

In fact, environmental campaigners, biologists and geophysicists have for years been informally calling the last six or seven decades the Anthropocene. But the authority with the last word on internationally-agreed geological labels − the International Commission on Stratigraphy − has yet to confirm the launch of the new geological epoch.

To help confirm the case for change, researchers have once again assembled the evidence and identified at least 16 ways in which humans have dramatically altered the planet since 1950, and the beginning of what is sometimes called The Great Acceleration.

For instance, humans have doubled the quantity of fixed nitrogen in the biosphere, created an alarming hole in the stratospheric ozone layer, released enough gases to raise the planetary temperature and precipitate global climate change, fashioned or forged perhaps 180,000 kinds of mineral (by comparison, only about 5,300 occur naturally) and − with dams, drains, wells, irrigation, and hydraulic engineering − effectively replumbed the world’s river systems.

Ineradicable scar

By forging metals and building structures, humans have become the greatest earth-moving force on the planet, and left a mark that will endure for aeons.

Altogether, humans have altered the world’s rivers, lakes, coastlines, vegetation, soils, chemistry and climate. The study makes grim reading.

“This is the first time that humans have documented humanity’s geological footprint on such a comprehensive scale in a single publication,” said Jaia Syvitski, of the University of Colorado, Boulder, who led the research team that assembled the evidence.

“We humans collectively got ourselves into this mess, we need to work together to reverse these environmental trends and dig ourselves out of it.

“Society shouldn’t feel complacent. Few people who read the manuscript should come away without emotions bubbling up, like rage, grief and even fear.” − Climate News Network

Abnormal heat spreads floods and wildfires globally

From the Arctic Circle to tropical Africa, abnormal heat is bringing mayhem and destruction and costing lives.

LONDON, 17 September, 2020 – Across the planet, abnormal heat is exacting a lethal toll. The west coast of the US is up in flames. Over recent months unprecedented high temperatures have been melting permafrost in Siberia, within the Arctic Circle. Fires have spread; many thousands of acres of taiga have been laid waste.

Across many parts of Africa unseasonable torrential rains are causing loss of life and crops.

Climate scientists are careful about attributing any one severe weather event to climate change until all data is gathered and a proper analysis is made.

But looking at various weather patterns around the world, fundamental changes in climate are happening – most related to big increases in temperature.

Along the western seaboard of the US people are having to cope not only with a prolonged drought but with temperatures which are way above normal.

As the ground and brush at the base of trees dries out, the ideal conditions for wildfires are set.

Over recent days more than 40,000 people in the state of Oregon have been told to evacuate their homes: dozens of people are believed to be missing in the mayhem caused by the fires.

“The debate is over.This is a climate damn emergency. This is real and it’s happening”

Kate Brown, Oregon’s governor, says that over three days recently more than 1,400 square miles of land was destroyed by fire – nearly double the amount burned over a typical year in the state.

“We have never seen this amount of uncontained fire”, said Brown.

“While our state reels from this horrific fire storm of hot weather, high winds and drought conditions, this will not be a one-time event.

“Unfortunately it is the bellwether of the future. We are feeling the acute impacts of climate change.”

Last month a group of Oregon’s leading industrialists launched a court action against Governor Brown, saying she overstepped her authority by introducing measures aimed at cutting carbon emissions in the state.

Further south in California, wildfires continue to burn. The skies of San Francisco and other cities have turned red in recent days. Smoke from the fires is causing severe air quality problems.

Gavin Newsom, California’s governor, launched an angry attack on President Trump and others who are sceptical about climate change, while visiting an area of the state destroyed by fire.

Africa inundated

“The debate is over” said Newsom. “This is a climate damn emergency. This is real and it’s happening.”

Studies say that since the early 1970s California has registered a more than fivefold increase in the annual incidence of forest fires.

A similar growing trend in abnormal heat and wildfires is being recorded in many parts of Siberia: soaring temperatures have been a big factor. In one Siberian town temperatures reached 38°C in mid-June – 18°C above the usual daytime temperature for the time of year.

Less reported on but a cause of death and hardship to some of the world’s poorest countries are floods that have been destroying homes and crops across large areas of the African continent.

In Somalia, still trying to establish itself as a functioning fully independent state in the face of terrorist attacks, nearly a million people have been affected by severe flooding in recent months.

Sudan and Ethiopia have also been subject to widespread flooding.

According to data from the US National Oceanic and Atmospheric Administration (NOAA), torrential rains and floods are affecting both east and west Africa. In Nigeria, Africa’s most populous state, thousands of homes have been destroyed and crops ruined. – Climate News Network

From the Arctic Circle to tropical Africa, abnormal heat is bringing mayhem and destruction and costing lives.

LONDON, 17 September, 2020 – Across the planet, abnormal heat is exacting a lethal toll. The west coast of the US is up in flames. Over recent months unprecedented high temperatures have been melting permafrost in Siberia, within the Arctic Circle. Fires have spread; many thousands of acres of taiga have been laid waste.

Across many parts of Africa unseasonable torrential rains are causing loss of life and crops.

Climate scientists are careful about attributing any one severe weather event to climate change until all data is gathered and a proper analysis is made.

But looking at various weather patterns around the world, fundamental changes in climate are happening – most related to big increases in temperature.

Along the western seaboard of the US people are having to cope not only with a prolonged drought but with temperatures which are way above normal.

As the ground and brush at the base of trees dries out, the ideal conditions for wildfires are set.

Over recent days more than 40,000 people in the state of Oregon have been told to evacuate their homes: dozens of people are believed to be missing in the mayhem caused by the fires.

“The debate is over.This is a climate damn emergency. This is real and it’s happening”

Kate Brown, Oregon’s governor, says that over three days recently more than 1,400 square miles of land was destroyed by fire – nearly double the amount burned over a typical year in the state.

“We have never seen this amount of uncontained fire”, said Brown.

“While our state reels from this horrific fire storm of hot weather, high winds and drought conditions, this will not be a one-time event.

“Unfortunately it is the bellwether of the future. We are feeling the acute impacts of climate change.”

Last month a group of Oregon’s leading industrialists launched a court action against Governor Brown, saying she overstepped her authority by introducing measures aimed at cutting carbon emissions in the state.

Further south in California, wildfires continue to burn. The skies of San Francisco and other cities have turned red in recent days. Smoke from the fires is causing severe air quality problems.

Gavin Newsom, California’s governor, launched an angry attack on President Trump and others who are sceptical about climate change, while visiting an area of the state destroyed by fire.

Africa inundated

“The debate is over” said Newsom. “This is a climate damn emergency. This is real and it’s happening.”

Studies say that since the early 1970s California has registered a more than fivefold increase in the annual incidence of forest fires.

A similar growing trend in abnormal heat and wildfires is being recorded in many parts of Siberia: soaring temperatures have been a big factor. In one Siberian town temperatures reached 38°C in mid-June – 18°C above the usual daytime temperature for the time of year.

Less reported on but a cause of death and hardship to some of the world’s poorest countries are floods that have been destroying homes and crops across large areas of the African continent.

In Somalia, still trying to establish itself as a functioning fully independent state in the face of terrorist attacks, nearly a million people have been affected by severe flooding in recent months.

Sudan and Ethiopia have also been subject to widespread flooding.

According to data from the US National Oceanic and Atmospheric Administration (NOAA), torrential rains and floods are affecting both east and west Africa. In Nigeria, Africa’s most populous state, thousands of homes have been destroyed and crops ruined. – Climate News Network

Annual planetary temperature continues to rise

More than 500 scientists from 61 countries have again measured the annual planetary temperature. The diagnosis is not good.

LONDON, 17 August, 2020 – Despite global promises to act on climate change, the Earth continues to warm. The annual planetary temperature confirms that the last 10 years were on average 0.2°C warmer than the first 10 years of this century. And each decade since 1980 has been warmer than the decade that preceded it.

The year 2019 was also one of the three warmest years since formal temperature records began in the 19th century. The only warmer years – in some datasets but not all – were 2016 and 2015. And all the years since 2013 have been warmer than all other years in the last 170.

The link with fossil fuel combustion remains unequivocal: carbon dioxide levels in the atmosphere increased by 2.5 parts per million (ppm) in 2019 alone. These now stand at 409 ppm. The global average for most of human history has hovered around 285 ppm.

Two more greenhouse gases – nitrous oxide and methane, both of them more short-lived – also increased measurably.

“This millennium has been warmer than any comparable period since the Industrial Revolution”

The study, in the Bulletin of the American Meteorological Society, is a sobering chronicle of the impact of climate change in the decade 2010-2019 and the year 2019 itself. It is the 30th such report, it is signed by 528 experts from 61 countries, and it is a catalogue of unwelcome records achieved and uncomfortable extremes surpassed.

July 2019 was the hottest month on record. Record high temperatures were measured in more than a dozen nations across Africa, Europe, Asia and the Caribbean. In North America, Alaska scored its hottest year on record.

The Arctic as a whole was warmer than in any year except 2016. Australia achieved a new nationally average daily temperature high of 41.9°C on 18 December, breaking the previous 2013 record by 1.6°C. But even Belgium and the Netherlands saw temperatures higher than 40°C.

For the 32nd consecutive year, the world’s alpine glaciers continued to get smaller and retreat further uphill. For the first time on record in inland Alaska, when measured at 26 sites, the active layer of permafrost failed to freeze completely. In September, sea ice around the Arctic reached a minimum that tied for the second lowest in the 41 years of satellite records.

Catalogue of extremes

Global sea levels set a new high for the eighth consecutive year and are now 87.6mm higher than the 1993 average, when satellite records began. At a depth of 700 metres, ocean temperatures reached new records, and the sea surface temperatures on average were the highest since 2016.

Drought conditions led to catastrophic wildfires in Australia, in Indonesia, Siberia and in the southern Amazon forests of Bolivia, Brazil and Peru. And around the equator, meteorologists catalogued 96 named tropical storms: the average for 1981 to 2010 was 82. In the North Atlantic, just one storm, Hurricane Dorian, killed 70 people and caused $3.4bn (£2.6bn) in damage in the Bahamas.

“This millennium has been warmer than any comparable period since the Industrial Revolution. A number of extreme events, such as wildfires, heatwaves and droughts, have at least part of their root linked to the rise in global temperature,” said Robert Dunn, of the UK Met Office, one of the contributors.

“And of course the rise in global temperature is linked to another climate indicator, the ongoing rise in emissions in greenhouse gases, notably carbon dioxide, nitrous oxide and methane.” – Climate News Network

More than 500 scientists from 61 countries have again measured the annual planetary temperature. The diagnosis is not good.

LONDON, 17 August, 2020 – Despite global promises to act on climate change, the Earth continues to warm. The annual planetary temperature confirms that the last 10 years were on average 0.2°C warmer than the first 10 years of this century. And each decade since 1980 has been warmer than the decade that preceded it.

The year 2019 was also one of the three warmest years since formal temperature records began in the 19th century. The only warmer years – in some datasets but not all – were 2016 and 2015. And all the years since 2013 have been warmer than all other years in the last 170.

The link with fossil fuel combustion remains unequivocal: carbon dioxide levels in the atmosphere increased by 2.5 parts per million (ppm) in 2019 alone. These now stand at 409 ppm. The global average for most of human history has hovered around 285 ppm.

Two more greenhouse gases – nitrous oxide and methane, both of them more short-lived – also increased measurably.

“This millennium has been warmer than any comparable period since the Industrial Revolution”

The study, in the Bulletin of the American Meteorological Society, is a sobering chronicle of the impact of climate change in the decade 2010-2019 and the year 2019 itself. It is the 30th such report, it is signed by 528 experts from 61 countries, and it is a catalogue of unwelcome records achieved and uncomfortable extremes surpassed.

July 2019 was the hottest month on record. Record high temperatures were measured in more than a dozen nations across Africa, Europe, Asia and the Caribbean. In North America, Alaska scored its hottest year on record.

The Arctic as a whole was warmer than in any year except 2016. Australia achieved a new nationally average daily temperature high of 41.9°C on 18 December, breaking the previous 2013 record by 1.6°C. But even Belgium and the Netherlands saw temperatures higher than 40°C.

For the 32nd consecutive year, the world’s alpine glaciers continued to get smaller and retreat further uphill. For the first time on record in inland Alaska, when measured at 26 sites, the active layer of permafrost failed to freeze completely. In September, sea ice around the Arctic reached a minimum that tied for the second lowest in the 41 years of satellite records.

Catalogue of extremes

Global sea levels set a new high for the eighth consecutive year and are now 87.6mm higher than the 1993 average, when satellite records began. At a depth of 700 metres, ocean temperatures reached new records, and the sea surface temperatures on average were the highest since 2016.

Drought conditions led to catastrophic wildfires in Australia, in Indonesia, Siberia and in the southern Amazon forests of Bolivia, Brazil and Peru. And around the equator, meteorologists catalogued 96 named tropical storms: the average for 1981 to 2010 was 82. In the North Atlantic, just one storm, Hurricane Dorian, killed 70 people and caused $3.4bn (£2.6bn) in damage in the Bahamas.

“This millennium has been warmer than any comparable period since the Industrial Revolution. A number of extreme events, such as wildfires, heatwaves and droughts, have at least part of their root linked to the rise in global temperature,” said Robert Dunn, of the UK Met Office, one of the contributors.

“And of course the rise in global temperature is linked to another climate indicator, the ongoing rise in emissions in greenhouse gases, notably carbon dioxide, nitrous oxide and methane.” – Climate News Network

Human action will decide how much sea levels rise

Sea levels will go on rising, because of human action. By how much, though, depends on what humans do next.

LONDON, 21 May 2020 – It’s a racing certainty that sea levels everywhere will go on climbing. Unless the world’s nations act to contain global warming, by 2100 the tides around the world will be one metre higher. And by 2300, they could be five metres higher.

Humans will not be able to blame natural causes: if beaches wash away and coastal towns flood, it will be because of deliberate human inaction.

And even if the 195 nations that met in Paris in 2015 and vowed to limit global warming to “well below” a maximum of 2°C by 2100 actually keep their promise, sea levels around the world will almost certainly rise by at least half a metre, as ever warmer oceans expand, and mountain glaciers and polar icecaps continue to melt.

The predicted levels are not new – individual research teams and the Intergovernmental Panel on Climate Change have said as much many times – but they represent a second and closer look, by 106 experts, at the forecasts for the future.

The charge of human complicity in sea level rise, too, is not new, but science has a way of continuously re-examining its own conclusions to see if they could be wrong. And the message is: they are not wrong.

“This provides a great deal of hope for the future, as well as strong motivation to act now”

Researchers from Hong Kong, Ireland, the UK, the US and Germany joined scientists from Singapore to consider, once again, what could happen to the world’s oceans under two scenarios: one in which global warming – already at least 1°C higher now than for most of human history – rose by no more than 2°C altogether, and one in which humankind went on burning fossil fuels and destroying tropical rainforests at ever greater rates.

The conclusion? They report in the journal Climate and Atmospheric Science that at the 2°C limit, seas will rise by 0.5 metres by 2100 and two metres by 2300.

If temperatures by 2100 reach 4.5°C, then by the century’s end the tides could reach anywhere between 0.6 and 1.3 metres above present levels. Two centuries on, the high tide mark could be anywhere between 1.7 and 5.6 metres above the present.

And these are the judgments of 106 scientists, each of whom has published at least six peer-reviewed scientific studies of future sea level rise in the last six years.

“We know that the planet will see additional sea level rise in the future. But there are stark differences in the amount of sea level rise experts project for low emissions compared to high emissions,” said one of the scientists, Andra Garner of Rowan University in the US.

Lessons from prehistory

“This provides a great deal of hope for the future, as well as strong motivation to act now to avoid the more severe impacts of rising sea levels.”

Quite separately, researchers in the US report in the journal Science Advances that they too, took a closer look at puzzles posed by past sea level change. Long before humans ever started burning coal, oil and natural gas, the ice caps retreated, and the seas rose.

The scientists reconstructed the history of sea levels and glaciation since the end of the Cretaceous era 60 million or so years ago, and matched them to estimated carbon dioxide levels long before the emergence of any human ancestry.

They concluded that all the changes in the past had natural explanations, but not the changes happening now.

Kenneth Miller of Rutgers University who led the study said: “Although carbon dioxide levels had an important influence on ice-free periods, minor variations in the Earth’s orbit were the dominant factor in terms of ice volume and sea level changes – until modern times.” – Climate News Network

Sea levels will go on rising, because of human action. By how much, though, depends on what humans do next.

LONDON, 21 May 2020 – It’s a racing certainty that sea levels everywhere will go on climbing. Unless the world’s nations act to contain global warming, by 2100 the tides around the world will be one metre higher. And by 2300, they could be five metres higher.

Humans will not be able to blame natural causes: if beaches wash away and coastal towns flood, it will be because of deliberate human inaction.

And even if the 195 nations that met in Paris in 2015 and vowed to limit global warming to “well below” a maximum of 2°C by 2100 actually keep their promise, sea levels around the world will almost certainly rise by at least half a metre, as ever warmer oceans expand, and mountain glaciers and polar icecaps continue to melt.

The predicted levels are not new – individual research teams and the Intergovernmental Panel on Climate Change have said as much many times – but they represent a second and closer look, by 106 experts, at the forecasts for the future.

The charge of human complicity in sea level rise, too, is not new, but science has a way of continuously re-examining its own conclusions to see if they could be wrong. And the message is: they are not wrong.

“This provides a great deal of hope for the future, as well as strong motivation to act now”

Researchers from Hong Kong, Ireland, the UK, the US and Germany joined scientists from Singapore to consider, once again, what could happen to the world’s oceans under two scenarios: one in which global warming – already at least 1°C higher now than for most of human history – rose by no more than 2°C altogether, and one in which humankind went on burning fossil fuels and destroying tropical rainforests at ever greater rates.

The conclusion? They report in the journal Climate and Atmospheric Science that at the 2°C limit, seas will rise by 0.5 metres by 2100 and two metres by 2300.

If temperatures by 2100 reach 4.5°C, then by the century’s end the tides could reach anywhere between 0.6 and 1.3 metres above present levels. Two centuries on, the high tide mark could be anywhere between 1.7 and 5.6 metres above the present.

And these are the judgments of 106 scientists, each of whom has published at least six peer-reviewed scientific studies of future sea level rise in the last six years.

“We know that the planet will see additional sea level rise in the future. But there are stark differences in the amount of sea level rise experts project for low emissions compared to high emissions,” said one of the scientists, Andra Garner of Rowan University in the US.

Lessons from prehistory

“This provides a great deal of hope for the future, as well as strong motivation to act now to avoid the more severe impacts of rising sea levels.”

Quite separately, researchers in the US report in the journal Science Advances that they too, took a closer look at puzzles posed by past sea level change. Long before humans ever started burning coal, oil and natural gas, the ice caps retreated, and the seas rose.

The scientists reconstructed the history of sea levels and glaciation since the end of the Cretaceous era 60 million or so years ago, and matched them to estimated carbon dioxide levels long before the emergence of any human ancestry.

They concluded that all the changes in the past had natural explanations, but not the changes happening now.

Kenneth Miller of Rutgers University who led the study said: “Although carbon dioxide levels had an important influence on ice-free periods, minor variations in the Earth’s orbit were the dominant factor in terms of ice volume and sea level changes – until modern times.” – Climate News Network

A stark climate warning from the green swan

The green swan brings a clear message from people who should know: bankers say the climate crisis means major change lies ahead.

LONDON, 10 February, 2020 − There’s more than a touch of déjà-vu about The green swan, another alarm call from the serious world of senior bankers about what the future is likely to hold.

Way back in 2006 the British economist Lord Nicholas Stern wrote his review warning of the serious impacts of climate change, in particular its effect on the global economy and the world’s financial systems.

For a brief period it seemed people were listening. Then, in 2008, the global financial crisis came along – a crisis caused, not by climate change but primarily by reckless bank lending, weak regulation and a sustained bout of greed.

World leaders panicked as the financial sector went into meltdown. Multi-billion dollar rescue packages were thrown about like confetti. Amid the panic, Stern’s warnings were largely forgotten.

It’s only recently that bankers and financiers have been revisiting his work and waving their own red flags about the dire consequences of a warming world.

The publisher of this book – the Bank of International Settlements (BIS) – is the central bank to the world’s central banks, its goal to preserve overall global monetary and financial stability. It is a conservative, some might say staid, institution, its utterances normally carefully calibrated and moderate in tone.

“Green swan events may force central banks to intervene as ‘climate rescuers of last resort’ and buy large sets of devalued assets”

The green swan is different: it graphically describes the sense of urgency now evident in banking boardrooms about global warming, the dire state of the planet and the consequent effects on the finance sector.

“Exceeding climate tipping points could lead to catastrophic and irreversible impacts that would make quantifying financial damages impossible”, say the authors.

“Avoiding this requires immediate and ambitious action towards a structural transformation of our economies, involving technological innovations that can be scaled, but also major changes in regulations and social norms.”

In other words, in non-banking terminology, expect the unexpected. Unless major international action is taken, climate change is going to cause lasting damage to the global economic and financial systems.

The “green swan” in the book’s title is a mutation of the concept of the “black swan” made famous by Nicholas Taleb in a 2007 book of the same name.

Key differences

Taleb used the term black swan to characterise random, unexpected events such as terrorist attacks or natural catastrophes and their impact on economies and financial systems. Uncertainty becomes a major factor: calculating risk in such circumstances is a very difficult, if not impossible, business.

This book’s authors characterise climate change in a similar way, talking of green swan events. But they draw some important distinctions.

Though the effects of global warming are highly uncertain, there is a high degree of certainty that major change is on the way. There is also certainty about the need for urgent action.

“Climate catastrophes are even more serious than most systemic financial crises”, say the authors.

“The complex chain reactions and cascade effects associated with both physical and transition risks could generate fundamentally unpredictable environmental, geopolitical, social and economic dynamics.”

The authors warn about central banks being caught in what they refer to as the uncharted waters of climate change. If government and other agencies don’t take action, the world’s central banks might not be able to ensure financial and price stability.

Ending fossil fuel

Fossil fuel companies could go to the wall. While this might be good for the climate, it would create financial turmoil.

“Green swan events may force central banks to intervene as ‘climate rescuers of last resort’ and buy large sets of devalued assets, to save the financial system once more.”

The warnings from the BIS are only the latest broadside from central bank authorities on the dangers of a warming world. Late last year the Bank of England, the UK’s central bank, announced it would be subjecting the country’s banks and insurance companies to a climate change-related stress test.

In recent days Singapore’s central monetary authority has introduced similar measures to test finance institutions’ preparedness in the face of global warming.

The overall message is clear: if you see a green swan, beware. A big climate change event is happening, and turmoil is on the way. − Climate News Network

* * * * *

The green swan: Central banking and financial stability in the age of climate change

An ebook by Patrick Bolton et al. published by the Bank of International Settlements/Banque de France

The green swan brings a clear message from people who should know: bankers say the climate crisis means major change lies ahead.

LONDON, 10 February, 2020 − There’s more than a touch of déjà-vu about The green swan, another alarm call from the serious world of senior bankers about what the future is likely to hold.

Way back in 2006 the British economist Lord Nicholas Stern wrote his review warning of the serious impacts of climate change, in particular its effect on the global economy and the world’s financial systems.

For a brief period it seemed people were listening. Then, in 2008, the global financial crisis came along – a crisis caused, not by climate change but primarily by reckless bank lending, weak regulation and a sustained bout of greed.

World leaders panicked as the financial sector went into meltdown. Multi-billion dollar rescue packages were thrown about like confetti. Amid the panic, Stern’s warnings were largely forgotten.

It’s only recently that bankers and financiers have been revisiting his work and waving their own red flags about the dire consequences of a warming world.

The publisher of this book – the Bank of International Settlements (BIS) – is the central bank to the world’s central banks, its goal to preserve overall global monetary and financial stability. It is a conservative, some might say staid, institution, its utterances normally carefully calibrated and moderate in tone.

“Green swan events may force central banks to intervene as ‘climate rescuers of last resort’ and buy large sets of devalued assets”

The green swan is different: it graphically describes the sense of urgency now evident in banking boardrooms about global warming, the dire state of the planet and the consequent effects on the finance sector.

“Exceeding climate tipping points could lead to catastrophic and irreversible impacts that would make quantifying financial damages impossible”, say the authors.

“Avoiding this requires immediate and ambitious action towards a structural transformation of our economies, involving technological innovations that can be scaled, but also major changes in regulations and social norms.”

In other words, in non-banking terminology, expect the unexpected. Unless major international action is taken, climate change is going to cause lasting damage to the global economic and financial systems.

The “green swan” in the book’s title is a mutation of the concept of the “black swan” made famous by Nicholas Taleb in a 2007 book of the same name.

Key differences

Taleb used the term black swan to characterise random, unexpected events such as terrorist attacks or natural catastrophes and their impact on economies and financial systems. Uncertainty becomes a major factor: calculating risk in such circumstances is a very difficult, if not impossible, business.

This book’s authors characterise climate change in a similar way, talking of green swan events. But they draw some important distinctions.

Though the effects of global warming are highly uncertain, there is a high degree of certainty that major change is on the way. There is also certainty about the need for urgent action.

“Climate catastrophes are even more serious than most systemic financial crises”, say the authors.

“The complex chain reactions and cascade effects associated with both physical and transition risks could generate fundamentally unpredictable environmental, geopolitical, social and economic dynamics.”

The authors warn about central banks being caught in what they refer to as the uncharted waters of climate change. If government and other agencies don’t take action, the world’s central banks might not be able to ensure financial and price stability.

Ending fossil fuel

Fossil fuel companies could go to the wall. While this might be good for the climate, it would create financial turmoil.

“Green swan events may force central banks to intervene as ‘climate rescuers of last resort’ and buy large sets of devalued assets, to save the financial system once more.”

The warnings from the BIS are only the latest broadside from central bank authorities on the dangers of a warming world. Late last year the Bank of England, the UK’s central bank, announced it would be subjecting the country’s banks and insurance companies to a climate change-related stress test.

In recent days Singapore’s central monetary authority has introduced similar measures to test finance institutions’ preparedness in the face of global warming.

The overall message is clear: if you see a green swan, beware. A big climate change event is happening, and turmoil is on the way. − Climate News Network

* * * * *

The green swan: Central banking and financial stability in the age of climate change

An ebook by Patrick Bolton et al. published by the Bank of International Settlements/Banque de France

Climate heat means new wine from familiar places

Each great wine is a unique product of place and climate. Rising heat could force new wine into old, prized bottles from famous cellars.

LONDON, 30 January, 2020 – As global average temperatures rise, so does uncertainty for the world’s wine-growers – with new wine the likely result. The great Bordeaux region of France will survive – but only if it stops serving claret.

Burgundy will still value its vines, but these won’t produce the high-priced tipple that the law defines as burgundy. Instead, what comes out of the cellars of Beaune or the Cote d’Or will be more like the output now from the southern Rhone.

That is always supposing that the growers keep up with rising temperatures by choosing grape varieties more likely to flourish with climate heating. A new study by European, Canadian and US scientists suggests that, even if the world’s most prized vineyards do abandon the grape varieties that made them prized in the first place, they will still lose up to a quarter of the space now in cultivation.

And if they don’t, the great wine regions of Europe could say goodbye to half their vineyards altogether. Producers in cool climates – Germany, New Zealand and the Pacific Northwest – could avoid major losses, but they will be tempted to switch to later-ripening varieties.

“Wine is like the canary in the coal mine for climate change impacts on agriculture, because these grapes are so climate-sensitive”

In the United Kingdom, where until very lately any wine harvest has been a gamble, the terrain might become suitable for at least five new varieties. New Zealand’s range of grape choices could double.

But Burgundian growers might have to forego the famously temperamental pinot noir grape and switch to grenache, or mourvedre, known in Spain as monastrell. The vintners of St Emilion, Pomerol and Medoc could see their cabernet sauvignon and merlot varieties replaced by mourvedre, according to research in the Proceedings of the National Academy of Sciences.

In fact, Europe’s growers have already had several warnings: hot and dry summers are now, for France, the norm. Extreme summer temperatures take their toll not just of the yield on the vine, but also of the people who have to pick the grapes, and even of the oak trees that provide the bark for the corks in the finished product.

Temperatures have already risen by more than 1°C worldwide, and the cool region of Champagne could be about to lose its sparkle.

Medieval records

But the new study is about far more than just the high-priced product of high-status wine regions. There are more than 1000 varieties of the grape Vitis vinifera, many of them sensitive to specific temperature and rainfall conditions. Even more helpfully, scientists can call upon harvest records that date back to medieval times.

So the grape seemed a good proxy for all of agriculture: from apples to wheat, from bananas to brassicas, the world’s growers can call on a huge range of crop varieties to buffer them from the shock of climate change driven by ever-increasing use of fossil fuels and ever-greater emissions of greenhouse gases into the atmosphere.

“In some ways, wine is like the canary in the coal mine for climate change impacts on agriculture, because these grapes are so climate-sensitive,” said co-author Benjamin Cook, of the Lamont Doherty Earth Observatory at Columbia University in the US.

The scientists considered 11 kinds of cultivar and dates of budding, flowering and harvest matched to seasonal temperature records, and found that if global temperatures rise by 2°C – and there is every indication that they could rise by more than 3°C – at least 51% of current wine-growing regions could be wiped out.

Higher warmth difficulties

“These estimates however ignore important changes that growers can make,” said Elizabeth Wolkovich, of the University of British Columbia, another author.

“We found that by switching to different varieties, vintners can lessen the damage to just 24% of areas lost. For example, in Burgundy, France, vintners can consider planting more heat-tolerant varieties such as syrah and grenache to replace the dominant pinot noir. And growers in regions such as Bordeaux may swap out cabernet sauvignon and merlot for mourvedre.”

But that’s if warming is limited to just 2°C. “At four degrees, around 77% of all areas may be lost, and planting new varieties will limit this to 58% losses,” said Ignacio Morales-Castilla, of the University of Acalá in Spain, who led the study.

“Wine-growing regions can adapt to a lower level of warming but at higher warming, it’s much harder.” – Climate News Network

Each great wine is a unique product of place and climate. Rising heat could force new wine into old, prized bottles from famous cellars.

LONDON, 30 January, 2020 – As global average temperatures rise, so does uncertainty for the world’s wine-growers – with new wine the likely result. The great Bordeaux region of France will survive – but only if it stops serving claret.

Burgundy will still value its vines, but these won’t produce the high-priced tipple that the law defines as burgundy. Instead, what comes out of the cellars of Beaune or the Cote d’Or will be more like the output now from the southern Rhone.

That is always supposing that the growers keep up with rising temperatures by choosing grape varieties more likely to flourish with climate heating. A new study by European, Canadian and US scientists suggests that, even if the world’s most prized vineyards do abandon the grape varieties that made them prized in the first place, they will still lose up to a quarter of the space now in cultivation.

And if they don’t, the great wine regions of Europe could say goodbye to half their vineyards altogether. Producers in cool climates – Germany, New Zealand and the Pacific Northwest – could avoid major losses, but they will be tempted to switch to later-ripening varieties.

“Wine is like the canary in the coal mine for climate change impacts on agriculture, because these grapes are so climate-sensitive”

In the United Kingdom, where until very lately any wine harvest has been a gamble, the terrain might become suitable for at least five new varieties. New Zealand’s range of grape choices could double.

But Burgundian growers might have to forego the famously temperamental pinot noir grape and switch to grenache, or mourvedre, known in Spain as monastrell. The vintners of St Emilion, Pomerol and Medoc could see their cabernet sauvignon and merlot varieties replaced by mourvedre, according to research in the Proceedings of the National Academy of Sciences.

In fact, Europe’s growers have already had several warnings: hot and dry summers are now, for France, the norm. Extreme summer temperatures take their toll not just of the yield on the vine, but also of the people who have to pick the grapes, and even of the oak trees that provide the bark for the corks in the finished product.

Temperatures have already risen by more than 1°C worldwide, and the cool region of Champagne could be about to lose its sparkle.

Medieval records

But the new study is about far more than just the high-priced product of high-status wine regions. There are more than 1000 varieties of the grape Vitis vinifera, many of them sensitive to specific temperature and rainfall conditions. Even more helpfully, scientists can call upon harvest records that date back to medieval times.

So the grape seemed a good proxy for all of agriculture: from apples to wheat, from bananas to brassicas, the world’s growers can call on a huge range of crop varieties to buffer them from the shock of climate change driven by ever-increasing use of fossil fuels and ever-greater emissions of greenhouse gases into the atmosphere.

“In some ways, wine is like the canary in the coal mine for climate change impacts on agriculture, because these grapes are so climate-sensitive,” said co-author Benjamin Cook, of the Lamont Doherty Earth Observatory at Columbia University in the US.

The scientists considered 11 kinds of cultivar and dates of budding, flowering and harvest matched to seasonal temperature records, and found that if global temperatures rise by 2°C – and there is every indication that they could rise by more than 3°C – at least 51% of current wine-growing regions could be wiped out.

Higher warmth difficulties

“These estimates however ignore important changes that growers can make,” said Elizabeth Wolkovich, of the University of British Columbia, another author.

“We found that by switching to different varieties, vintners can lessen the damage to just 24% of areas lost. For example, in Burgundy, France, vintners can consider planting more heat-tolerant varieties such as syrah and grenache to replace the dominant pinot noir. And growers in regions such as Bordeaux may swap out cabernet sauvignon and merlot for mourvedre.”

But that’s if warming is limited to just 2°C. “At four degrees, around 77% of all areas may be lost, and planting new varieties will limit this to 58% losses,” said Ignacio Morales-Castilla, of the University of Acalá in Spain, who led the study.

“Wine-growing regions can adapt to a lower level of warming but at higher warming, it’s much harder.” – Climate News Network

Ultra-fast computers could avert global disaster

The world can be saved. It needs global co-operation, careful research and the building of ultra-fast computers.

LONDON, 13 December, 2019 – The way to steer the planet safely away from overwhelming climate crisis may sound familiar, though it’s staggeringly ambitious: just use incredibly powerful and ultra-fast computers.

Studies in two separate journals have called for new thinking about global change. One warns that only a genuine accommodation with nature can save humankind from catastrophic change. The other argues that present understanding of the trajectories of global heating is so uncertain that what is needed is a global co-operation to deliver what scientists call exascale supercomputer climate modelling: exascale means calculations at rates of a billion billion operations a second.

There’s a snag: nobody has yet built a working exascale computer, though several groups hope to succeed within a few years. But when it’s done it could transform the prospects of life on Earth.

“We cannot save the planet – and ourselves – until we understand how tightly woven people and the natural benefits that allow us to survive are,” said Jianguo Liu of Michigan State University, one of the authors of a paper in the journal Science.

“We have learned new ways to understand these connections, even as they spread across the globe. This strategy has given us the power to understand the full scope of the problem, which allows us to find true solutions.”

“Human actions are causing the fabric of life to unravel, posing serious risks for the quality of life of people”

And Tim Palmer of Oxford University, an author of a perspective paper in the Proceedings of the National Academy of Sciences, has called for a new and international investment in sophisticated climate modelling, exploiting a new generation of computers, in much the same way that physicists at CERN in Geneva co-operated to explore the sequence of events in the first microsecond of creation.

“By comparison with new particle colliders or space telescopes, the amount needed, maybe around $100 million a year, is very modest indeed. In addition, the benefit/cost ratio to society of having a much clearer picture of the dangers we are facing in the coming decades by our ongoing actions, seems extraordinarily large,” he said.

“To be honest, all is needed is the will to work together across nations, on such a project. Then it will happen.”

The point made by authors of the Science study is that humankind depends acutely on the natural world for at least 18 direct benefits: these include pollination and the dispersal of seeds, the regulation of clean air, and of climate, and of fresh water, the protection of topsoils, the control of potential pests and diseases, the supplies of energy, food and animal fodder, the supplies of materials and fabrics and yields of new medicines and biochemical compounds.

Massive change

“Human actions are causing the fabric of life to unravel, posing serious risks for the quality of life of people”, the authors warn.

“Human actions have directly altered at least 70% of land surface; 66% of ocean surface is experiencing cumulative impacts; around 85% of wetland area has been lost since the 1700s and 77% of rivers longer than 1000 km no longer flow freely from source to sea.”

There was a need for “transformative action” on a global scale to address root economic, social and technological causes and to avert catastrophic decline of the living world. “Although the challenge is formidable, every delay will make the task harder”, they warn.

But in a world of rapid change – with species at increasing risk of extinction and global heating about to trigger catastrophic climate change – there is still the challenge of working out what the implications of any change might be.

The argument is that human society must change, and so too must the scientific community. Climate modelling might deliver broad answers, but researchers would still need to be sure what might work best in any particular circumstances, and that would require new and vastly more complex levels of mathematical calculation and data interpretation.

Space-race urgency

Professor Palmer and his colleague Bjorn Stevens of the Max Planck Institute for Meteorology in Hamburg call for better understanding of the need for change.

“What is needed is the urgency of the space race aimed, not at the Moon or Mars, but rather toward harnessing the promise of exascale supercomputing to reliably simulate Earth’s regional climate (and associated extremes) globally”, they argue.

“This will only be possible if the broader climate science community begins to articulate its dissatisfaction with business as usual – not just among themselves, but externally to those who seek to use the models for business, policy, or humanitarian reasons.

“Failing to do so becomes an ethical issue in that it saddles us with the status quo: a strategy that hopes, against all evidence, to surmount the abyss between scientific capability and societal needs.” – Climate News Network

The world can be saved. It needs global co-operation, careful research and the building of ultra-fast computers.

LONDON, 13 December, 2019 – The way to steer the planet safely away from overwhelming climate crisis may sound familiar, though it’s staggeringly ambitious: just use incredibly powerful and ultra-fast computers.

Studies in two separate journals have called for new thinking about global change. One warns that only a genuine accommodation with nature can save humankind from catastrophic change. The other argues that present understanding of the trajectories of global heating is so uncertain that what is needed is a global co-operation to deliver what scientists call exascale supercomputer climate modelling: exascale means calculations at rates of a billion billion operations a second.

There’s a snag: nobody has yet built a working exascale computer, though several groups hope to succeed within a few years. But when it’s done it could transform the prospects of life on Earth.

“We cannot save the planet – and ourselves – until we understand how tightly woven people and the natural benefits that allow us to survive are,” said Jianguo Liu of Michigan State University, one of the authors of a paper in the journal Science.

“We have learned new ways to understand these connections, even as they spread across the globe. This strategy has given us the power to understand the full scope of the problem, which allows us to find true solutions.”

“Human actions are causing the fabric of life to unravel, posing serious risks for the quality of life of people”

And Tim Palmer of Oxford University, an author of a perspective paper in the Proceedings of the National Academy of Sciences, has called for a new and international investment in sophisticated climate modelling, exploiting a new generation of computers, in much the same way that physicists at CERN in Geneva co-operated to explore the sequence of events in the first microsecond of creation.

“By comparison with new particle colliders or space telescopes, the amount needed, maybe around $100 million a year, is very modest indeed. In addition, the benefit/cost ratio to society of having a much clearer picture of the dangers we are facing in the coming decades by our ongoing actions, seems extraordinarily large,” he said.

“To be honest, all is needed is the will to work together across nations, on such a project. Then it will happen.”

The point made by authors of the Science study is that humankind depends acutely on the natural world for at least 18 direct benefits: these include pollination and the dispersal of seeds, the regulation of clean air, and of climate, and of fresh water, the protection of topsoils, the control of potential pests and diseases, the supplies of energy, food and animal fodder, the supplies of materials and fabrics and yields of new medicines and biochemical compounds.

Massive change

“Human actions are causing the fabric of life to unravel, posing serious risks for the quality of life of people”, the authors warn.

“Human actions have directly altered at least 70% of land surface; 66% of ocean surface is experiencing cumulative impacts; around 85% of wetland area has been lost since the 1700s and 77% of rivers longer than 1000 km no longer flow freely from source to sea.”

There was a need for “transformative action” on a global scale to address root economic, social and technological causes and to avert catastrophic decline of the living world. “Although the challenge is formidable, every delay will make the task harder”, they warn.

But in a world of rapid change – with species at increasing risk of extinction and global heating about to trigger catastrophic climate change – there is still the challenge of working out what the implications of any change might be.

The argument is that human society must change, and so too must the scientific community. Climate modelling might deliver broad answers, but researchers would still need to be sure what might work best in any particular circumstances, and that would require new and vastly more complex levels of mathematical calculation and data interpretation.

Space-race urgency

Professor Palmer and his colleague Bjorn Stevens of the Max Planck Institute for Meteorology in Hamburg call for better understanding of the need for change.

“What is needed is the urgency of the space race aimed, not at the Moon or Mars, but rather toward harnessing the promise of exascale supercomputing to reliably simulate Earth’s regional climate (and associated extremes) globally”, they argue.

“This will only be possible if the broader climate science community begins to articulate its dissatisfaction with business as usual – not just among themselves, but externally to those who seek to use the models for business, policy, or humanitarian reasons.

“Failing to do so becomes an ethical issue in that it saddles us with the status quo: a strategy that hopes, against all evidence, to surmount the abyss between scientific capability and societal needs.” – Climate News Network

Water stress rises as more wells run dry

Soon, communities and even nations could be drawing water faster than the skies can replenish it. As the wells run dry, so will the rivers.

LONDON, 9 October, 2019 − Within three decades, almost 80% of the lands that depend on groundwater will start to reach their natural irrigation limits as the wells run dry.

In a world of increasing extremes of drought and rainfall, driven by rising global temperatures and potentially catastrophic climate change, the water will start to run out.

It is happening already: in 20% of those water catchments in which farmers and cities rely on pumped groundwater, the flow of streams and rivers has fallen and the surface flow has dwindled, changed direction or stopped altogether.

“The effects can be seen already in the Midwest of the United States and in the Indus Valley project between Afghanistan and Pakistan,” said Inge de Graaf, a hydrologist at the University of Freiburg.

Groundwater – the billions of tonnes locked in the soils and bedrock, held in vast chalk and limestone aquifers and silently flowing through cracks in other sediments – is the terrestrial planet’s biggest single store of the liquid that sustains all life.

“If we continue to pump as much groundwater in the coming decades as we have done so far, a critical point will be reached for regions in southern and central Europe as well as in North African countries”

Groundwater supplies the inland streams and rivers, and the flow from tributaries is an indicator of the levels of water already in the ground.

For thousands of years, communities have drawn water from wells in the dry season and relied on wet season rainfall to replenish it. But as human numbers have grown, as agriculture has commandeered more and more of the land, and as cities have burgeoned, demand has in some places begun to outstrip supply. The fear is that rising average temperatures will intensify the problem.

Dr de Graaf and colleagues from the Netherlands and Canada report in the journal Nature that they used computer simulations to establish the likely pattern of withdrawal and flow. The news is not good.

“We estimate that, by 2050, environmental flow limits will be reached for approximately 42% to 79% of the watershed in which there is groundwater pumping worldwide, and this will generally occur before substantial losses in groundwater storage are experienced,” they write.

That drylands – home to billions of people – will experience water stress with rising temperatures is not news. Climate scientists have been issuing warnings for years.

Ground level drops

And demand for groundwater has increased with the growth of the population and the worldwide growth of the cities: some US cities are at risk of coastal flooding just because so much groundwater has been extracted that the ground itself has been lowered.

The important thing about the latest research is that it sets – albeit broadly – a timetable and a map of where the water stress is likely to be experienced first.

In a hotter world, plants and animals will demand more water. But in a hotter world, the probability of extremes of drought increases.

“If we continue to pump as much groundwater in the coming decades as we have done so far, a critical point will be reached also for regions in southern and central Europe – such as Portugal, Spain and Italy – as well as in North African countries,” Dr de Graaf warned.

“Climate change may even accelerate this process, as we expect less precipitation, which will further increase the extraction of groundwater and cause dry areas to dry out completely.” − Climate News Network

Soon, communities and even nations could be drawing water faster than the skies can replenish it. As the wells run dry, so will the rivers.

LONDON, 9 October, 2019 − Within three decades, almost 80% of the lands that depend on groundwater will start to reach their natural irrigation limits as the wells run dry.

In a world of increasing extremes of drought and rainfall, driven by rising global temperatures and potentially catastrophic climate change, the water will start to run out.

It is happening already: in 20% of those water catchments in which farmers and cities rely on pumped groundwater, the flow of streams and rivers has fallen and the surface flow has dwindled, changed direction or stopped altogether.

“The effects can be seen already in the Midwest of the United States and in the Indus Valley project between Afghanistan and Pakistan,” said Inge de Graaf, a hydrologist at the University of Freiburg.

Groundwater – the billions of tonnes locked in the soils and bedrock, held in vast chalk and limestone aquifers and silently flowing through cracks in other sediments – is the terrestrial planet’s biggest single store of the liquid that sustains all life.

“If we continue to pump as much groundwater in the coming decades as we have done so far, a critical point will be reached for regions in southern and central Europe as well as in North African countries”

Groundwater supplies the inland streams and rivers, and the flow from tributaries is an indicator of the levels of water already in the ground.

For thousands of years, communities have drawn water from wells in the dry season and relied on wet season rainfall to replenish it. But as human numbers have grown, as agriculture has commandeered more and more of the land, and as cities have burgeoned, demand has in some places begun to outstrip supply. The fear is that rising average temperatures will intensify the problem.

Dr de Graaf and colleagues from the Netherlands and Canada report in the journal Nature that they used computer simulations to establish the likely pattern of withdrawal and flow. The news is not good.

“We estimate that, by 2050, environmental flow limits will be reached for approximately 42% to 79% of the watershed in which there is groundwater pumping worldwide, and this will generally occur before substantial losses in groundwater storage are experienced,” they write.

That drylands – home to billions of people – will experience water stress with rising temperatures is not news. Climate scientists have been issuing warnings for years.

Ground level drops

And demand for groundwater has increased with the growth of the population and the worldwide growth of the cities: some US cities are at risk of coastal flooding just because so much groundwater has been extracted that the ground itself has been lowered.

The important thing about the latest research is that it sets – albeit broadly – a timetable and a map of where the water stress is likely to be experienced first.

In a hotter world, plants and animals will demand more water. But in a hotter world, the probability of extremes of drought increases.

“If we continue to pump as much groundwater in the coming decades as we have done so far, a critical point will be reached also for regions in southern and central Europe – such as Portugal, Spain and Italy – as well as in North African countries,” Dr de Graaf warned.

“Climate change may even accelerate this process, as we expect less precipitation, which will further increase the extraction of groundwater and cause dry areas to dry out completely.” − Climate News Network

Nuclear war could ruin Earth and leave only losers

As the potential for nuclear war in Asia hots up, scientists have chilling news for those far from the battleground: we will all suffer.

LONDON, 3 October, 2019 − Nobody can emerge from a nuclear war as a winner, says a US team of scientists, and the planet they inherit may be ravaged by mass starvation.

Their scenario is stark. The year is 2025, they suggest. A dangerous tension has grown more dangerous with the years and suddenly India and Pakistan begin a nuclear exchange. The outcome? More people will die almost immediately than were killed in the entire Second World War.

And the global climate inevitably will feel the heat of the exchange. Up to 36 million tonnes of smoke and soot from subcontinental cities incinerated by even modest nuclear warheads will be blasted high into the upper atmosphere, spread around the globe and darken the skies.

Planetary average temperatures will drop by at least 2°C and by as much as 5°C, and for the next 10 years regional temperatures could plummet to levels characteristic of the last Ice Age. Rainfall will diminish by 15% to 30%, and so will the productivity of the oceans, terrestrial forests, grasslands and croplands.

Rapid build-up

This would be enough to trigger mass starvation around the rest of the globe, according to the scientists’ study, published in the journal Science Advances.

“Nine countries have nuclear weapons, but Pakistan and India are the only ones rapidly increasing their arsenals,” said Alan Robock, of Rutgers University in the US. “Because of the continuing unrest between these two nuclear-armed countries, particularly over Kashmir, it is important to understand the consequences of nuclear war.”

The world’s nuclear arsenal totals around 13,900 weapons: nine-tenths of them held by Russia and the United States. But Britain, France, China, Israel, India and Pakistan are thought to have between 100 and 300 each, and none of these states is bound by treaties that require them to reveal the number of launchers or the number of warheads carried by missiles.

Of these states, Pakistan and India have a long history of military tension – including four conventional wars in 1947, 1965, 1971 and 1999, and a long history of claim and counter-claim to the territory of Kashmir.

“Nuclear weapons cannot be used in any rational scenario but could be used by accident or as a result of hacking, panic or deranged world leaders. The only way to prevent this is to eliminate them”

Professor Robock and nine other scientists, led by Owen Brian Toon of the University of Colorado at Boulder, consulted military and policy experts to develop a simple scenario of how a nuclear war might happen, and then made estimates of the likely yield of 250 weapons that might be used by both nations in the first week of conflict.

India has 400 cities with more than 100,000 people, and by 2025 Pakistan could have an arsenal big enough to attack two-thirds of them; Pakistan has about 60 such dense conurbations and India could react and hit all of them with two weapons each. The expected almost-immediate death toll would be between 50 million and 125 million.

The scientists examined accounts of the only time nuclear weapons were used in anger – over Hiroshima and Nagasaki in Japan in 1945 – and made calculations of the impact of nuclear weaponry on brick and steel, cement and stone, pitch and tile, concluding that between 16 and 36 million tonnes of black carbon would rise into the upper atmosphere, spread around the planet and screen the sunlight, for up to a decade, to set up the conditions for poor harvests or no harvests, and severe food shortages.

“An India-Pakistan war could double the normal death rate in the world,” Professor Toon said. “This is a war that would have no precedent in human experience.”

Lesson from wildfires

This is not the first such study: in 2017 a group of scientists revived concerns about a potential “nuclear autumn” with deadly consequences that would follow a nuclear exchange.

In August this year Professor Robock and colleagues looked at the smoke from devastating Canadian wildfires in 2017 and used these as a lesson for the conflagration and clouds of smoke that would follow thermonuclear strikes on cities, with, once again, deadly consequences for parts of the world far from the conflict zone.

And Professor Toon was part of the team of scientists that – in 1983, around the most tense months of the Cold War – first developed the theory of “nuclear winter” that might follow all-out global thermonuclear war, to propose that there could be no winners, and no safe neutral zones, in such a conflict.

“Nuclear weapons cannot be used in any rational scenario but could be used by accident or as a result of hacking, panic or deranged world leaders,” Professor Robock said. “The only way to prevent this is to eliminate them.” − Climate News Network

As the potential for nuclear war in Asia hots up, scientists have chilling news for those far from the battleground: we will all suffer.

LONDON, 3 October, 2019 − Nobody can emerge from a nuclear war as a winner, says a US team of scientists, and the planet they inherit may be ravaged by mass starvation.

Their scenario is stark. The year is 2025, they suggest. A dangerous tension has grown more dangerous with the years and suddenly India and Pakistan begin a nuclear exchange. The outcome? More people will die almost immediately than were killed in the entire Second World War.

And the global climate inevitably will feel the heat of the exchange. Up to 36 million tonnes of smoke and soot from subcontinental cities incinerated by even modest nuclear warheads will be blasted high into the upper atmosphere, spread around the globe and darken the skies.

Planetary average temperatures will drop by at least 2°C and by as much as 5°C, and for the next 10 years regional temperatures could plummet to levels characteristic of the last Ice Age. Rainfall will diminish by 15% to 30%, and so will the productivity of the oceans, terrestrial forests, grasslands and croplands.

Rapid build-up

This would be enough to trigger mass starvation around the rest of the globe, according to the scientists’ study, published in the journal Science Advances.

“Nine countries have nuclear weapons, but Pakistan and India are the only ones rapidly increasing their arsenals,” said Alan Robock, of Rutgers University in the US. “Because of the continuing unrest between these two nuclear-armed countries, particularly over Kashmir, it is important to understand the consequences of nuclear war.”

The world’s nuclear arsenal totals around 13,900 weapons: nine-tenths of them held by Russia and the United States. But Britain, France, China, Israel, India and Pakistan are thought to have between 100 and 300 each, and none of these states is bound by treaties that require them to reveal the number of launchers or the number of warheads carried by missiles.

Of these states, Pakistan and India have a long history of military tension – including four conventional wars in 1947, 1965, 1971 and 1999, and a long history of claim and counter-claim to the territory of Kashmir.

“Nuclear weapons cannot be used in any rational scenario but could be used by accident or as a result of hacking, panic or deranged world leaders. The only way to prevent this is to eliminate them”

Professor Robock and nine other scientists, led by Owen Brian Toon of the University of Colorado at Boulder, consulted military and policy experts to develop a simple scenario of how a nuclear war might happen, and then made estimates of the likely yield of 250 weapons that might be used by both nations in the first week of conflict.

India has 400 cities with more than 100,000 people, and by 2025 Pakistan could have an arsenal big enough to attack two-thirds of them; Pakistan has about 60 such dense conurbations and India could react and hit all of them with two weapons each. The expected almost-immediate death toll would be between 50 million and 125 million.

The scientists examined accounts of the only time nuclear weapons were used in anger – over Hiroshima and Nagasaki in Japan in 1945 – and made calculations of the impact of nuclear weaponry on brick and steel, cement and stone, pitch and tile, concluding that between 16 and 36 million tonnes of black carbon would rise into the upper atmosphere, spread around the planet and screen the sunlight, for up to a decade, to set up the conditions for poor harvests or no harvests, and severe food shortages.

“An India-Pakistan war could double the normal death rate in the world,” Professor Toon said. “This is a war that would have no precedent in human experience.”

Lesson from wildfires

This is not the first such study: in 2017 a group of scientists revived concerns about a potential “nuclear autumn” with deadly consequences that would follow a nuclear exchange.

In August this year Professor Robock and colleagues looked at the smoke from devastating Canadian wildfires in 2017 and used these as a lesson for the conflagration and clouds of smoke that would follow thermonuclear strikes on cities, with, once again, deadly consequences for parts of the world far from the conflict zone.

And Professor Toon was part of the team of scientists that – in 1983, around the most tense months of the Cold War – first developed the theory of “nuclear winter” that might follow all-out global thermonuclear war, to propose that there could be no winners, and no safe neutral zones, in such a conflict.

“Nuclear weapons cannot be used in any rational scenario but could be used by accident or as a result of hacking, panic or deranged world leaders,” Professor Robock said. “The only way to prevent this is to eliminate them.” − Climate News Network

Scientists back global climate strike

20 September sees the start of a week-long youth-led global climate strike. Students will be voicing their demands for action − backed by many scientists.

LONDON, 20 September, 2019 − Leading scientists have declared their support for the global climate strike which starts today.

In a statement published by the Earth League, headed Humanity is Tipping the Scales of the World, 20 respected scientists throw their weight into the argument. Among a stellar company, they number Lord Nicholas Stern, Johan Rockström from the Potsdam Institute for Climate Impact Research in Germany, and Hans Joachim Schellnhuber, its founder.

The world is approaching a dual tipping point of social and environmental systems that will arguably determine the future of life-support systems on Earth, they say.

On the one hand, young people across the world are struggling to tip the social scale towards swift and concerted climate action.

“If that tipping towards sustainability does not happen quickly, we risk crossing different kinds of tipping points – those in the Earth System that may threaten the stability of life on our planet.

“Humanity is tipping the scales of our planet’s future”

“Tropical coral reef systems and the Arctic summer ice are at risk already at 1.5°C warming and we now know that there is a likely tipping point for the destabilisation of the Greenland Ice sheet, which may be as low as 2°C.”

Much of the factual material they explain is by now all too well-known; many of their specific warnings, however acutely they present them, echo with leaden but still necessary familiarity. But there is a new note to what they have to tell the world: that time really is running out.

“Humanity may tend to take the benign conditions of the past 10,000 years for granted, but we are already experiencing the highest global mean temperature on Earth since the last Ice Age”, they write.

“If anything, there is a growing understanding that expert assessments, which are usually conservative in the best sense of the word, have contributed to allow decision-makers to underestimate – not overestimate – the risks of climate impacts. Now it is apparent that impacts are happening much sooner and more severely than expected.

“In each report since 2001, the Intergovernmental Panel on Climate Change has corrected its assessments of the so-called ‘reasons for concern’ upwards, i.e., to higher levels of worry.

Irreversible change

“The world is following a path which even at a conservative assessment will result in more than 3°C of warming – with definite irreversible tipping points – by the end of this century. Last time we had this level of warming on Earth was 4-5 million years ago.”

The scientists echo the call of the young strikers: “This is not a single-generation issue”, they say. “Humanity is tipping the scales of our planet’s future.”

Serious scientists are usually cautious people, unwilling to stick their necks out and speak out on something about which they are not absolutely certain. But today’s statement is not like that − and it is not the first of its kind.

Three other experts, all renowned in their fields, last April urged support for the school strikers, declaring: “The world’s youth have begun to persistently demonstrate for the protection of the climate and other foundations of human well-being … Their concerns are justified and supported by the best available science. The current measures for protecting the climate and biosphere are deeply inadequate.”

They attracted the support of more than 6,000 of their colleagues. When scientists are prepared to voice their fears as openly as they are now doing, where does that leave the rest of us? − Climate News Network

20 September sees the start of a week-long youth-led global climate strike. Students will be voicing their demands for action − backed by many scientists.

LONDON, 20 September, 2019 − Leading scientists have declared their support for the global climate strike which starts today.

In a statement published by the Earth League, headed Humanity is Tipping the Scales of the World, 20 respected scientists throw their weight into the argument. Among a stellar company, they number Lord Nicholas Stern, Johan Rockström from the Potsdam Institute for Climate Impact Research in Germany, and Hans Joachim Schellnhuber, its founder.

The world is approaching a dual tipping point of social and environmental systems that will arguably determine the future of life-support systems on Earth, they say.

On the one hand, young people across the world are struggling to tip the social scale towards swift and concerted climate action.

“If that tipping towards sustainability does not happen quickly, we risk crossing different kinds of tipping points – those in the Earth System that may threaten the stability of life on our planet.

“Humanity is tipping the scales of our planet’s future”

“Tropical coral reef systems and the Arctic summer ice are at risk already at 1.5°C warming and we now know that there is a likely tipping point for the destabilisation of the Greenland Ice sheet, which may be as low as 2°C.”

Much of the factual material they explain is by now all too well-known; many of their specific warnings, however acutely they present them, echo with leaden but still necessary familiarity. But there is a new note to what they have to tell the world: that time really is running out.

“Humanity may tend to take the benign conditions of the past 10,000 years for granted, but we are already experiencing the highest global mean temperature on Earth since the last Ice Age”, they write.

“If anything, there is a growing understanding that expert assessments, which are usually conservative in the best sense of the word, have contributed to allow decision-makers to underestimate – not overestimate – the risks of climate impacts. Now it is apparent that impacts are happening much sooner and more severely than expected.

“In each report since 2001, the Intergovernmental Panel on Climate Change has corrected its assessments of the so-called ‘reasons for concern’ upwards, i.e., to higher levels of worry.

Irreversible change

“The world is following a path which even at a conservative assessment will result in more than 3°C of warming – with definite irreversible tipping points – by the end of this century. Last time we had this level of warming on Earth was 4-5 million years ago.”

The scientists echo the call of the young strikers: “This is not a single-generation issue”, they say. “Humanity is tipping the scales of our planet’s future.”

Serious scientists are usually cautious people, unwilling to stick their necks out and speak out on something about which they are not absolutely certain. But today’s statement is not like that − and it is not the first of its kind.

Three other experts, all renowned in their fields, last April urged support for the school strikers, declaring: “The world’s youth have begun to persistently demonstrate for the protection of the climate and other foundations of human well-being … Their concerns are justified and supported by the best available science. The current measures for protecting the climate and biosphere are deeply inadequate.”

They attracted the support of more than 6,000 of their colleagues. When scientists are prepared to voice their fears as openly as they are now doing, where does that leave the rest of us? − Climate News Network