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Retreating glaciers
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Glaciers have retreated dramatically all over world. Here are some photos of Alaska’s Muir Glacier, photographed by glaciologist William O. Field on 13 August 1941 (left) and by geologist Bruce F. Molnia on 31 August 2004 (right). Credit: National Snow and Ice Data Center, W. O. Field, B. F. Molnia.


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