Examining the Scientific Consensus on Climate Change

According to the survey "Examining the Scientific Consensus on Climate Change" published in January 2009:

"It seems that the debate on the authenticity of global warming and the role played by human activity is largely nonexistent among those who understand the nuances and scientific basis of long-term climate processes."

Of the 3,146 survey respondents, 96.2% of the climatologists engaged in research believe that average global temperatures have increased in the last 200 years and 97.4% of them believe that human activity is a major cause of global warming.

Including all scientists who participated in the survey (most of whom are not climatologists), 90% agree global temperatures have increased compared to levels before 1800, and 80% consider human activity a primary cause.

Citation: Doran, P. T., and M. Kendall Zimmerman (2009), Examining the Scientific Consensus on Climate Change, Eos Trans. AGU, 90(3), doi:10.1029/2009EO030002.