"There's no consensus. It is a hoax."

So said Rep. Paul Broun (R-GA), a medical doctor, during the debate over the Waxman-Markey bill in June 2009. See him on YouTube here. Senator James Inhofe and numerous other deniers have made the same claims, repeatedly. Even Big Tobacco did not claim that the smoking-cancer link is a hoax. The accusation goes beyond merely questioning research results or suggesting alternative explanations, both fair game within science. To claim that global warming is a hoax amounts to an indictment of science itself as blatantly corrupt.

If global warming is a hoax, it is the greatest in human history. As the lists below show, there is a stronger consensus on global warming than virtually any topic in science.

The academies of science of the following 33 nations or regions have issued statements accepting global warming as real and human-caused:

Australia
Belgium
Brazil
Cameroon
Canada
Caribbean
China
France
Germany
Ghana
India
Indonesia
Ireland
Italy
Japan
Kenya
Madagasgar
Malaysia
Mexico
Nigeria
New Zealand
Russia
Senegal
South Africa
Sudan
Sweden
Switzerland
Tanzania
Uganda
United Kingdom
United States
Zambia
Zimbabwe

The following organizations have also issued statements accepting human-caused global warming. "No...scientific body of national or international standing is known to reject the basic findings of human influence on recent climate change." These two lists come from Logical Science and Wikipedia.

American Academy of Pediatrics
American Association for the Advancement of Science
American Association of Petroleum Geologists
American Association of State Climatologists
American Association of Wildlife Veterinarians
American Astronomical Society
American Chemical Society
American College of Preventive Medicine
American Geological Institute
American Geophysical Union
American Institute of Physics
American Institute of Professional Geologists
American Medical Association
American Meteorological Society (AMS)
American Physical Society
American Public Health Association
American Quaternary Association
American Society for Microbiology
American Statistical Association
Arctic Climate Impact Assessment
Australian Coral Reef Society
Australian Medical Association
Australian Meteorological and Oceanographic Society
Canadian Federation of Earth Sciences
Canadian Foundation for Climate and Atmospheric Sciences
Canadian Meteorological and Oceanographic Society
Engineers Australia
Environmental Protection Agency
European Academy of Sciences and Arts
European Federation of Geologists
European Geosciences Union
European Science Foundation
Federal Climate Change Science Program
Federation of Australian Scientific and Technological Societies
Geological Society of America
Geological Society of Australia
Geological Society of London
Institute of Biology (UK)
InterAcademy Council
Intergovernmental Panel on Climate Change
International Association for Great Lakes Research
International Council of Academies of Engineering and Technological Sciences
International Council on Science
International Union for Quaternary Research
International Union of Geodesy and Geophysics
NASA's Goddard Institute of Space Studies
National Association of Geoscience Teachers
National Center for Atmospheric Research
National Oceanic and Atmospheric Administration
National Research Council
Network of African Science Academies
Nobel prize-winners
Pew Center on Climate Change
Polish Academy of Sciences
Royal Meteorological Society (UK)
Royal Society of New Zealand
Society of American Foresters
State of the Canadian Cryosphere
The Wildlife Society (international)
UN Project on Climate Variability and Predictability
Union of Concerned Scientistsa
United Nations Environment Program
United Nations Framework Convention on Climate Change
US Geological Survey
Woods Hole Oceanographic Institute
Woods Hole Research Center
World Federation of Public Health Associations
World Health Organization
World Meteorological Organization
World Wildlife Fund