Police chiefs have long observed that on sweltering summer nights, crime rates go up. Now a University of California, Berkeley study links climate-change-induced weather patterns -sizzling heat, droughts, torrential rains - with increases in ethnic clashes, riots and wars. Agricultural economist Marshall Burke and his colleagues conducted a meta analysis of 60 previous studies that looked at climatic events and their link to human conflict, including the fall of the Mayan Empire, civil conflicts in Africa, ethnic clashes in India, road rage in the U.S. and even the type of pitches thrown during Major League Baseball games when temperatures rise.
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