Scientists Explain Four-Year Drought An unprecedented warm-up of the western Pacific Ocean -- scientists think that partially explains a drought that has caused havoc across much of the United States, southern Europe and southwest Asia. NPR's Richard Harris reports.
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Scientists Explain Four-Year Drought

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An unprecedented warm-up of the western Pacific Ocean — scientists think that partially explains a drought that has caused havoc across much of the United States, southern Europe and southwest Asia. NPR's Richard Harris reports.