The prolonged rainfall last August in the southern United States dumped three times as much rain on Louisiana as Hurricane Katrina did, resulting in catastrophic flooding that the American Red Cross called the worst U.S. natural disaster since Hurricane Sandy. In 1900, the chances of a storm like that occurring were once every 50 years, but scientists at the National Oceanic and Atmospheric Administration now expect extreme rainfall events to occur once every 30 years. Thanks to global warming, our recovery time has been halved.
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