In Alaska, global warming has caused the Columbia Glacier to retreat more than 7 miles in the last 20 years, leaving calves of ice in Prince William Sound.
In Alaska, global warming has caused the Columbia Glacier to retreat more than 7 miles in the last 20 years, leaving calves of ice in Prince William Sound. Seth Borenstein/MCT
In Alaska, global warming has caused the Columbia Glacier to retreat more than 7 miles in the last 20 years, leaving calves of ice in Prince William Sound. Seth Borenstein/MCT

Real debate or just hot air? A primer on 'climategate'

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