Years ago, says a veteran skier, "conditions were fantastic" at the world's highest ski area, on 17,250-foot (5,260 meters) Chacaltaya Glacier near La Paz, Bolivia.
Barely Frosted … Now Photograph by Bernard Francou
Today, few attempt the ski run down Bolivia's Chacaltaya Glacier, even after a snowfall. The glacier has shriveled in the past decade, turning much of the slope into a boulder field.
The peak of Huayna Potosí towers to nearly 20,000 feet (6,000 meters) behind the city of El Alto, Bolivia. The glaciers that drape the mountain help keep streams flowing during Bolivia's dry season, supplying drinking water and hydroelectric power to the city's burgeoning population. But the smaller glaciers are shrinking fast, threatening future water supplies.
An Icy Front Photograph by James Balog
A single summer stole more than 200 feet (60 meters) of ice from the snout of Sólheimajökull, a glacier in Iceland, seen in April 2006.