The risks can be debated and contested, of course—and they are. The most common response is that, yes, there could be negative impacts, but not as negative as the impacts of climate change itself. David Keith goes further, arguing that we have the power to effectively minimize the risks with appropriate design; he proposes an SRM program that would slowly ramp up and then down again, “in combination with cutting emissions and with a goal to reduce—but not eliminate—the rate of temperature rise.” As he explains in his 2013 book, A Case for Climate Engineering, “Crop losses, heat stress and
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