Melting Glaciers
George L. Mallory/David Breashears

The Main Rongbuk Glacier and the north face of Mount Everest, as photographed from Tibet in 1921 (left) by George L. Mallory and in 2007 (right) by David Breashears. Situated at an elevation of 16,600 to 21,200 feet, the glacier experienced an average vertical loss of 330 feet between 1921 and 2007. Mallory and his climbing partner, Andrew Irvine, disappeared high on the northern slopes of Everest in 1924 during an attempt to be the first to summit the mountain. (Mallory photo courtesy of Royal Geographical Society.)

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