Sink or swim as one, says science. Solve nature and climate together, or neither of the twin crises will be soluble.
LONDON, 11 June, 2021 − Two of the world’s leading scientific institutions have joined forces to arrive at a not very surprising conclusion: solve nature and climate together, or forget them both. If the world does not work to tackle the climate crisis and the extinction threat confronting millions of wild species together, it has little hope of solving either of them separately.
So says a report published by the snappily-titled Intergovernmental Science-Policy Platform on Biodiversity and Ecosystem Services (IPBES) and the Intergovernmental Panel on Climate Change (IPCC), each respected for their commanding knowledge in their own fields.
The report, the IPBES/IPCC Workshop Report, which marks the first collaboration between the two bodies’ scientists, is not content simply to urge joint action on the intertwined problems threatening the world. It goes on to identify what it says are key options for solving them.
Both biodiversity loss and climate change are driven by human economic activities and mutually reinforce each other, the report says.
While previous policies have largely tackled the twin crises independently of each other, addressing the synergies between the two simultaneously offers hope of maximising benefits and meeting the UN’s Sustainable Development Goals.
“The warmer the world gets, the less food, drinking water and other key contributions nature can make to our lives”
“Human-caused climate change is increasingly threatening nature and its contributions to people, including its ability to help mitigate climate change. The warmer the world gets, the less food, drinking water and other key contributions nature can make to our lives, in many regions”, said Prof. Hans-Otto Pörtner, co-chair of the report’s scientific steering committee.
“Changes in biodiversity, in turn, affect climate, especially through impacts on nitrogen, carbon and water cycles,” he said. “The evidence is clear: a sustainable global future for people and nature is still achievable, but it requires transformative change with rapid and far-reaching actions of a type never before attempted, building on ambitious emissions reductions.
“Solving some of the strong and apparently unavoidable trade-offs between climate and biodiversity will entail a profound collective shift of individual and shared values concerning nature − such as moving away from the concept of economic progress based solely on GDP growth, to one that balances human development with multiple values of nature for a good quality of life, while not overshooting biophysical and social limits.”
The authors also warn that narrowly-focused action to combat climate change can directly and indirectly harm nature, and vice versa, but say there are many ways to benefit both areas.
Their suggestions include:
* Stopping the loss and degradation of carbon- and species-rich ecosystems on land and in the ocean and restoring them. The authors say reducing deforestation and forest degradation can help to lower human-caused greenhouse gas emissions by between 0.4 and 5.8 gigatonnes of carbon dioxide equivalent every year.
End damaging subsidies
* Increasing sustainable agriculture and forestry to improve the capacity to adapt to climate change, improve biodiversity, increase carbon storage and reduce emissions. The report estimates this improved management of cropland and grazing systems could offer annual climate change mitigation potential of 3 to 6 gigatonnes of CO2-equivalent.
* Enhanced and better targeted conservation supported by strong climate adaptation and innovation. Protected areas currently represent about 15% of land and 7.5% of the ocean. Global estimates of what the world needs range from 30 to 50% of all ocean and land surface areas.
* Eliminating subsidies that support both local and national activities harmful to biodiversity, such as deforestation, excessive fertilisation and over-fishing, can also support climate change mitigation and adaptation. It can also help to change individual consumption patterns, reduce loss and waste and shift diets, especially in rich countries, towards more plant-based options.
The report also warns against climate mitigation and adaptation measures which it says can harm biodiversity and nature’s contributions to people. These measures, it says, include increasing irrigation capacity, a common response to adapt agricultural systems to drought which it says often leads to water conflicts, dam building and long- term soil degradation from salinisation. − Climate News Network
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