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Question
Is global warming primarily caused by humans?
Answer Mostly Disagree
Quote [Sun and cosmic rays] will probably be able to account for somewhere between a half and the whole of the increase in the Earth's temperature that we have seen in the last century.

Reference

  
Expert(s)
Date 23 Feb 2007
Source Link http://www.nationalpost.com/news/story.html?id=975f250d-ca5d-4f40-b687-a1672ed1f684
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