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Question
Is global warming primarily caused by humans?
Answer Mostly Agree
Quote Most of the global average warming over the past 50 years is very likely due to anthropogenic GHG increases and it is likely that there is a discernible human-induced warming averaged over each continent (except Antarctica).

Reference

 
Expert(s)
Date 01 Jan 2008
Source Link http://www.ipcc.ch/ipccreports/ar4-syr.htm
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