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American AM, 03/21/07, Hour 2
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March 21, 2007 12:07 PM PDT

Guest: Andrew Revkin, Science Writer, The New York Times, Author, The North Pole Was Here
Other Links: Chapter from his book and lots of great background on climate: www.nytimes.com/learning/globalwarming This is our "Energy Challenge" series: www.nytimes.com/energychallenge