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Scientists Reconstruct the History of Drought for North America

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Little is known about what triggers major droughts, yet they occur all across North America, often having serious economic and social impacts. Researchers from the Lamont-Doherty Earth Observatory have used 835 annual tree-ring chronologies based on measurements from 20 to 30 thousand treeamples across the United States, Mexico and parts of Canada to reconstruct a history of drought over the last 2005 years.

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