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Editorial use only .National Ice Core Laboratory. Curator of the National Ice Core Laboratory in Denver, Colorado, USA, holding a one-meter section of an ice core stored at -36 degrees Celsius. This lab stores 19,000 metres of ice cores from Antarctica, Greenland, and North America, and makes them available to scientists studying climate change and other issues. The lab is part of the U.S. Geological Survey (USGS), funded by the National Science Foundation. (KEYSTONE/SCIENCE PHOTO LIBRARY/JIM WEST/SCIENCE PHOTO LIBRARY)