As researchers under the guidance of John Cook at Skeptical Science discovered in a "citizen science" survey of 11,944 peer-reviewed articles, 1.6 percent of the authors expressing an opinion on the subject rejected or were uncertain about the consensus that the earth is undergoing anthropogenic (human-generated) global warming (AGW).
And 97.1 percent of the nearly 4,000 articles in which the author(s) took a position endorsed the AGW consensus. (The survey was published May 15 in Environmental Research Letters as an open access article.)
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