Using time-lapse and conventional photography as well as digital video, the Extreme Ice Survey is the most extensive visual study ever conducted to illustrate the catastrophic melting of glacial ice. Serviced via foot, horseback, dogsled, skis, fishing boats, and helicopters at 15 sites in the Northern Hemisphere and programmed to shoot once an hour, every hour of daylight, each of the 26 cameras captures approximately 4,000 images per year.