The Jannu Glacier, in Nepal, as photographed in 1899 (left) by Italian mountaineer Vittorio Sella and in 2009 (right) by David Breashears. In 110 years, the glacier, located below 25,295-foot Mount Jannu in the Kangchenjunga region, has virtually disappeared. Sella (1859-1943) took part in many leading mountaineering expeditions and is considered one of history’s greatest mountain photographers. (Sella photo courtesy of Sella Foundation.)

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