The 3-mile- (4,884-meter-) high glacier was pounded by rain every afternoon during the team's 13-day trip, something the American scientist has never encountered in three decades of drilling ice cores. He lay awake at night listening to the water gushing beneath him.
By the time they were ready to head home, ice around their sheltered campsite had melted a staggering 12 inches (30 centimeters).
"These glaciers are dying," said Thompson, one of the world's most accomplished glaciologists. "Before I was thinking they had a few decades, but now I'd say we're looking at years."