put up enough aerosols to cut warming in half, rather than to counteract it entirely—what might be called “semi-engineering.” “If you did not try to restore temperatures to pre-industrial levels, then the evidence from, really, all climate models is that most of the big climate hazards that people know about—extreme precipitation, extreme temperatures, changes in water availability, sea-level rise—are reduced,” he told me. This is true, he said, “basically everywhere, in the sense that there are no obvious regions that are made worse off. That result, I think, is really stunning.”
