Plan B

 Ever since the threat of climate change was first made public, scientists have offered the possibility of a get-out-of-jail-free card: geoengineering. While reducing emissions is hard and complicated, why not just engineer the Earth's atmosphere in the meantime?

Decades later, the science of geoengineering is still in its infancy, but a growing number of researchers are trying to change that.  Should they?

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