Mega-drought threat to US Southwest

Nature: The Dust Bowl -- the seven-year drought that devastated large swathes of US prairie land in the 1930s -- was the worst prolonged environmental disaster recorded for the country. But a study of the American Southwest's more distant climatic past reveals that the catastrophic drought was a mere dry spell compared to the 'mega-droughts' that were recurring long before humans began to settle the continent. The findings, reported in a paper in Nature1 this week, add to concerns that the already arid......

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