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Megadrought

November 6, 2011--Scientists find evidence of ancient megadrought in Southwestern U.S. (Science Daily)

A new study at the the University of Arizona's Laboratory of Tree-Ring Research has revealed a previously unknown multi-decade drought period in the second century A.D. The findings give evidence that extended periods of aridity have occurred at intervals throughout our past. Almost 900 years ago, in the mid-12th century, the southwestern U.S.


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