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David Letterman has signed on to join 10 other celebrities doing episodes for the climate change docu-series "Years of Living Dangerously," making the Emmy Award-winning show his first venture after his "Late Night" television stint.
Letterman was approached by "Years of Living Dangerously" producers Joel Bach and David Gelber about his availability after watching the talk show host interview scientists on the issue, according to The Hollywood Reporter.
