The two pictures show an "alarming" retreat in ice over more than 80 years. The first was taken in 1921 by British mountaineer George Mallory, who later died trying to conquer Everest.
The Asia Society commissioned the same picture to be taken of the main Rongbuk glacier on the northern slope of Mount Everest in Tibet in 2007. The new picture by mountaineer David Breashears show that the glacier is shrunk and withered.