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Old Drought May Be Warning for New West A study in the journal Science finds that droughts in the American West can last hundreds of years. Scientists saw evidence of a centuries-long dry spell in tree rings. There may be implications for the future of the modern West. NPR's John Nielsen reports.
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Old Drought May Be Warning for New West

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Old Drought May Be Warning for New West

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Old Drought May Be Warning for New West

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Old Drought May Be Warning for New West

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A study in the journal Science finds that droughts in the American West can last hundreds of years. Scientists saw evidence of a centuries-long dry spell in tree rings. There may be implications for the future of the modern West. NPR's John Nielsen reports.