NATIONAL ICE CORE LABORATORY
The National Ice Core Laboratory is the world’s leading ice core research facility. Operated by the U. S. Geological Survey, it was founded in 1993 near Denver, Colorado. The laboratory maintains a 55,000-cubic-foot freezer at a temperature of -32º F and stores stainless-steel tubes containing 22,000 meters (13.7 miles) of ice cores from the polar regions.