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In mid-August 2016, a slow moving storm dumped more than two feet of rain in parts of southern Louisiana, forcing tens of thousands of people to evacuate and taking the lives of at least a dozen citizens. An attribution analysis found that the statistical return period for extreme rain events of that magnitude has dropped from an average of 50 years to 30 years due to global warming from greenhouse gases. And the amount of rain that would have fallen during a typical 30-year event in 1900 would have been 10% less than a similar event today, for example, 23 inches instead of 25. Graphic by NOAA Climate.gov, based on Van der Wiel, et al., 2016.