Scientists are keeping a wary eye on the Amazon's rain forests after a severe drought struck some 1.2 million square miles of forest last year.
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It marked the second drought in five years severe enough to be considered a once-a-century event. The previous drought, in 2005, affected 734,000 square miles of forest, according to an analysis published Friday in the journal Science.During the 2010 event, water coursing along the Rio Negro, a tributary
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