If we were staring down the barrel of an imminent and unavoidable climate emergency, the kinds of monstrous calculations implicit in geoengineering—sacrifice part of Latin America in order to save all of China, or save the remaining glaciers and land ice to prevent catastrophic global sea level rise but risk endangering India’s food source—might be unavoidable. But even if we acquire enough information to make those kinds of calculations (and it’s hard to imagine how we could), we notably are not at that point. We have options, ones that would greatly decrease the chances of ever confronting
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