O'Reilly said question of whether humans are causing global warming is "all guesswork"

SUMMARY: Responding to a viewer's email about whether the current global warming "scare" is "natural" or "man-made," Fox News' Bill O'Reilly asserted: "It's all guesswork." Contrary to O'Reilly's assertion, the United Nations Intergovernmental Panel on Climate Change has concluded that the Earth is warming and human activity is very likely responsible for most of that warming.

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