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Images: A century of polar exploration

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• Scientists seek cold, hard facts on polar changes

March 2, 2007 3:58 AM PST

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By the time air makes it down to Antarctica, it has been circulated so thoroughly that scientists can get a good representation of global gas content averages. At the Atmospheric Research Observatory, located near the South Pole and pictured at left, researchers track changes in the global atmosphere.

Photo by Lieutenant Mark Boland, NOAA

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