The Paris Agreement could provide a forum for international cooperation on risky, planet-scale engineering to cool the Earth. Tatiana Grozetskaya/Shutterstcok.com

US exit from Paris climate accord makes discussing how and whether to engineer the planet even harder

It’s increasingly likely that at some point, the world’s nations will need to broach the fraught discussion of geoengineering. The UN climate accord was a natural forum to do it.

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