The ice man cometh.

The article presents an interview with Lonnie Thompson, a geophysicist at Ohio State University in Columbus and a pioneer in the study of tropical glaciers. His adventures while gathering ice cores at high altitude have led colleagues to describe him as the closest living thing to Indiana Jones. After 50 expeditions in the Himalayas, the Andes, East Africa and Tibet, Lonnie Thompson has probably spent more time at high altitude than any other researcher. And with thousands of metres of ice cores stored away in his deep freeze, he believes he will prove the tropics are the true source of much of the Earth's climate variability.