What’s solar geoengineering… and why is it controversial?

A new report from the National Academies of Sciences, Engineering and Medicine tackles a controversial question: Is solar geoengineering – an approach designed to cool the Earth by reflecting sunlight back into space or modifying clouds – a potential tool for countering climate change? The report, produced by a committee of 16 experts from diverse fields, does not take a position but concludes that the concept should be studied. It calls for creating a multidisciplinary research program, in coordination with other countries and managed by the U.S. Global Change Research Program, that seeks to fill in the many knowledge gaps…

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