Extreme weather events were just the most obvious climate-related calamities. There were increasingly wide fluctuations in temperature—unexpected surges in heat followed by morning frosts—and unpredictable rainfall. Almost half a year’s worth of precipitation might fall in a single week, which would flood the soil and destroy crops. Grain and vegetable harvests that once produced enough to feed a family for close to a year now lasted less than five months. “Inattention to these issues,” the report’s authors wrote, can drive “more migration to the United States” and “put at grave risk the
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