physicist David Keith makes a case for a form of climate engineering that is moderate, responsive, and temporary. “Moderate” means that the amounts of sulfate or calcite would be just enough to reduce the rate of warming, not cancel it altogether; moderation is a virtue because small manipulations are less likely to bring unwelcome surprises. “Responsive” means that any manipulation would be careful, gradual, closely monitored, constantly adjusted, and, if indicated, halted altogether. And “temporary” means that the program would be designed only to give humanity breathing space until it
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