Professor Lonnie Thompson is a paleoclimatologist at Ohio State University. He and his wife study ice core samples to determine the impact of climate change. Called the Paul Revere of glacier melt, Thompson warns, "The ongoing widespread melting of high-elevation glaciers and ice caps, particularly in low to middle latitudes, provides some of the strongest evidence to date that a large-scale, pervasive, and, in some cases, rapid change in Earth’s climate system is underway."
Watch a video of a glacier melting, posted by the Extreme Ice Survey, and see how it was made.
NOVA: Profile of Lonnie Thompson