Al Gore, 19 June 2006: Do you know any credible scientist who says "wait a minute - this hasn't been proven?" Is there still a debate? The debate's over. The people who dispute the international consensus on global warming are in the same category now with the people who think the moon landing was staged on a movie lot in Arizona.The Associated Press, 15 February 2009: Former astronaut Harrison Schmitt, who walked on the moon, doesn't believe that humans are causing global warming. "I don't think the human effect is significant compared to the natural effect," said Schmitt.
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