For years, the idea of geoengineering—artificially lowering global temperatures through technological means—has been met with skepticism. Only a handful of dedicated and much-criticized scientists have argued for researching it at all, and when others weighed in, it was generally to trash the idea. This September, in a study published in the journal Frontiers in Science, more than 40 experts in climate change, polar geosciences, and ocean patterns warned that geoengineering was extremely unlikely to work and likely to have dangerous consequences. Spraying reflective aerosols into the atmosphere to deflect the sun’s heat, could, for instance, “cause stratospheric heating, which may alter atmospheric circulation patterns, leading to wintertime warming over northern Eurasia,” they wrote.

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