Greenland Ice Sheet, July 2008. Air bubbles possibly up to 15,000 years old, are released as ice sheet melts. From ICE: Portrait of the World’s Vanishing Glaciers. (Copyright EIS/James Balog)

Greenland Ice Sheet, July 2008. Air bubbles possibly up to 15,000 years old, are released as ice sheet melts. From ICE: Portrait of the World’s Vanishing Glaciers. (Copyright EIS/James Balog)

Greenland Ice Sheet, July 2008. Air bubbles possibly up to 15,000 years old, are released as ice sheet melts. From ICE: Portrait of the World’s Vanishing Glaciers. (Copyright EIS/James Balog)

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