An earlier spring in Montana's Glacier National Park means full waterfalls at first — but much drier summers. Robert Glusic/Corbis hide caption

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There's A Big Leak In America's Water Tower
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A new study suggests the Greenland Ice Sheet did not fully melt during previous periods of global warming — and that it preserved a tundra beneath it. Joshua Brown/ University of Vermont hide caption

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The small patch in the middle of the image is Aulacomnium turgidum, a type of bryophyte plant. Researchers in the Canadian Arctic say they are surprised the bryophytes were still green, even after being covered by ice. Courtesy of Caroline La Farge hide caption

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From the May 29, 2013, 'Morning Edition': NPR's Joe Palca reports on the discovery
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