Top Scientists Advise European Commission on Solar Radiation Modification Technologies
A group of leading scientists nominated by academies has provided advice to the European Commission about solar radiation modification technologies through the Scientific Advice Mechanism. This advice underscores that solar radiation modification technologies are not yet mature and deploying them could have many effects, both intended and unintended.
The Scientific Advice Mechanism provides independent scientific evidence and policy recommendations to the European institutions.
For decades, technologies have been proposed that would reduce or counteract global warming by reflecting sunlight away from the Earth. These proposals, known as “solar radiation modification” technologies, include stratospheric aerosol injection, cloud brightening, and others.
However, none of the technologies is mature and deploying them could have many effects, both intended and unintended. They could have negative impacts on ecosystems, change rainfall patterns, and hamper food production. Moreover, they would not address the direct impacts of greenhouse gases.
The benefits and risks of these proposals are also highly uncertain. Member of the Group of Chief Scientific Advisors, Prof. Nebojsa Nakicenovic, adds that “Deploying them could have effects on the climate in different parts of the world which would be difficult to predict and difficult to manage in practice.”
“These climate interventions could present grave risks if they are ever deployed, or come to be relied upon to protect critical habitats—coral reeds, Arctic and Antarctic ice sheets, farmland key to food security—by lowering temperatures in a world of global warming,” says Prof. Benjamin Sovacool, co-chair of the SAPEA working group. “Our Evidence Review Report synthesises the vast evidence on these controversial options, with a wonderful inclusion of work in the social sciences, arts, and humanities,” he adds.
Some solar radiation modification applications would need to run for generations-long timescales and have impacts across the entire planet. A strong global governance framework would be needed for this, with adequate representation for all affected parties, and with compensation mechanisms for those potentially harmed. No such framework exists, and it is not clear how one could be created.
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