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Robert Redford and the Fragile West

McDonald Lake, Glacier National Park, Montana

McDonald Lake, Glacier National Park, Montana

This still, deep lake was carved by glaciers. But now another force is shaping the park: global warming. By 2020, all of the park's glaciers will melt away because of climate change.

Photo: Ansel Adams/Time & Life Pictures/Getty Images

Jan 01, 1941