he scientists approached were listed in the 2007 edition of the American Geological Institute's Directory of Geoscience Departments. Two questions were key: Have mean global temperatures risen compared to pre-1800s levels, and has human activity been a significant factor in changing mean global temperatures?
About 90 percent of the scientists agreed with the first question and 82 percent the second.
The strongest consensus on the causes of global warming came from climatologists who are active in climate research, with 97 percent agreeing humans play a role.
Petroleum geologists and meteorologists were among the biggest doubters, with only 47 percent and 64 percent, respectively, believing in human involvement.
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"The petroleum geologist response is not too surprising, but the meteorologists' is very interesting," said Peter Doran associate professor of earth and environmental sciences at the University of Illinois at Chicago, and one of the survey's authors.
"Most members of the public think meteorologists know climate, but most of them actually study very short-term phenomenon."
However, Doran was not surprised by the near-unanimous agreement by climatologists.
"They're the ones who study and publish on climate science.