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If we can’t reduce greenhouse-gas emissions fast enough to ward off catastrophic climate change, geoengineering may offer a fallback plan. Serious researchers are increasingly exploring measures, such as spraying tiny particles into the air to reflect more sunlight back into space, that wouldn’t reduce emissions but could offset the rise in global temperatures.

A study published January 22 in Nature Ecology & Evolution suggests this is a bad idea. If the world ever starts doing geoengineering, the study warns, it may be too dangerous to ever stop.

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Category: Science