Tropical Glaciers Slowly Vanish

For others, change already looms over daily life. In Bolivia, Angelo Martinez points toward Chacaltaya, Bolivia's only ski resort, riddled with exposed rock. Five years ago, he says, that view would have been covered in snow.

These days Mr. Martinez carries a snowboard up the side of the Chacaltaya glacier to the only patch of snow still skiable. A member of the Andean Ski Club, he wonders just how much longer the nearly 70-year-old club will exist. "There isn't much we can do," he says.