List of scientists who dispute global warming

Many earth and climate scientists endorse the idea that humans are significantly contributing to global warming.

This is a partial sampling of scientists who have made assessments and statements about global warming that dispute the findings of other scientists, the latter of which were summarized in the Intergovernmental Panel on Climate Change and endorsed by various scientific bodies. There are many more people who disagree with global warming than are listed here. A number of them have used descriptors such as "scam", fraud", "scare" and "fear mongering" to describe global warming.

The IPCC claim is that the global average surface temperature has risen over the last century. Their opinion on climate change was summarized in the 2001 Third Assessment Report of the Intergovernmental Panel on Climate Change (IPCC). Their main conclusions on global warming at that time were as follows:

1. The global average surface temperature has risen 0.6 ± 0.2 °C since the late 19th century, and 0.17 °C per decade in the last 30 years.
2. "There is new and stronger evidence that most of the warming observed over the last 50 years is attributable to human activities", in particular emissions of the greenhouse gases carbon dioxide and methane.
3. If greenhouse gas emissions continue the warming will also continue, with temperatures projected to increase by 1.4 °C to 5.8 °C between 1990 and 2100. Accompanying this temperature increase will be increases in some types of extreme weather and a projected sea level rise. The balance of impacts of global warming become significantly negative at larger values of warming.

There have been several efforts to compile lists of dissenting scientists, including a 2008 US senate minority report of 'more than 700 international scientists who dissent', the Oregon Petition, and a 2007 list of "500 Scientists Whose Research Contradicts Man-Made Global Warming Scares" by the Heartland Institute, all three of which have been criticized in turn by global warming proponents.

For the purpose of this list, a "scientist" is defined as an individual who has published at least one peer-reviewed article in the broad field of natural sciences, although not necessarily in a field relevant to climatology. Since the publication of the IPCC Third Assessment Report, each has made a clear statement in his or her own words disagreeing with one or more of the report's three main conclusions. Their views on climate change are usually described in more detail in their biographical articles.

Scientists questioning the accuracy of IPCC climate projections

These scientists have said that it is not possible to project global climate accurately enough to justify the ranges projected for temperature and sea-level rise over the next century. They may not conclude specifically that the current IPCC projections are either too high or too low, but that the projections are likely to be inaccurate due to inadequacies of current global climate modeling.

• David Bellamy, botanist.
• Lennart Bengtsson, meteorologist, Reading University.
• Piers Corbyn, owner of the business WeatherAction which makes weather forecasts.
• Judith Curry, Professor and former chair of the School of Earth and Atmospheric Sciences at the Georgia Institute of Technology.
• Freeman Dyson, professor emeritus of the School of Natural Sciences, Institute for Advanced Study; Fellow of the Royal Society.
• Steven Goddard, geologist, numerous studies of data tampering
• Steven E. Koonin, theoretical physicist and director of the Center for Urban Science and Progress at New York University.
• Richard Lindzen, Alfred P. Sloan emeritus professor of atmospheric science at the Massachusetts Institute of Technology and member of the National Academy of Sciences.
• Craig Loehle, ecologist and chief scientist at the National Council for Air and Stream Improvement.
• Patrick Moore, former president of Greenpeace Canada.
• Nils-Axel Mörner, retired head of the Paleogeophysics and Geodynamics Department at Stockholm University, former chairman of the INQUA Commission on Sea Level Changes and Coastal Evolution (1999–2003).
• Garth Paltridge, retired chief research scientist, CSIRO Division of Atmospheric Research and retired director of the Institute of the Antarctic Cooperative Research Centre, visiting fellow Australian National University.
• Tom Quirk, corporate director of biotech companies and former board member of the Institute of Public Affairs, an Australian conservative think-tank.
• Denis Rancourt, former professor of physics at University of Ottawa, research scientist in condensed matter physics, and in environmental and soil science.
• Burt Rutan, aerospace engineer and inventor
• Harrison Schmitt, geologist, Apollo 17 Astronaut, former U.S. Senator.
• Peter Stilbs, professor of physical chemistry at Royal Institute of Technology, Stockholm.
• Philip Stott, professor emeritus of biogeography at the University of London.
• Hendrik Tennekes, retired director of research, Royal Netherlands Meteorological Institute.
• Anastasios Tsonis, distinguished professor at the University of Wisconsin-Milwaukee.
• Fritz Vahrenholt, German politician and energy executive with a doctorate in chemistry.
• Ivar Giaever, Norwegian–American physicist and Nobel laureate in physics (1973).

Scientists arguing that global warming is primarily caused by natural processes

Graph showing the ability with which a global climate model is able to reconstruct the historical temperature record, and the degree to which those temperature changes can be decomposed into various forcing factors. It shows the effects of five forcing factors: greenhouse gases, man-made sulfate emissions, solar variability, ozone changes, and volcanic emissions.

These scientists have said that the observed warming is more likely to be attributable to natural causes than to human activities. Their views on climate change are usually described in more detail in their biographical articles.

• Khabibullo Abdusamatov, astrophysicist at Pulkovo Observatory of the Russian Academy of Sciences
• Sallie Baliunas, retired astrophysicist, Harvard-Smithsonian Center for Astrophysics
• Timothy Ball, historical climatologist, and retired professor of geography at the University of Winnipeg
• Ian Clark, hydrogeologist, professor, Department of Earth Sciences, University of Ottawa
• Chris de Freitas, associate professor, School of Geography, Geology and Environmental Science, University of Auckland
• David Douglass, solid-state physicist, professor, Department of Physics and Astronomy, University of Rochester
• Don Easterbrook, emeritus professor of geology, Western Washington University
• William Happer, physicist specializing in optics and spectroscopy; emeritus professor, Princeton University
• Ole Humlum, professor of geology at the University of Oslo
• Wibjörn Karlén, professor emeritus of geography and geology at the University of Stockholm.
• William Kininmonth, meteorologist, former Australian delegate to World Meteorological Organization Commission for Climatology
• David Legates, associate professor of geography and director of the Center for Climatic Research, University of Delaware
• Anthony Lupo, professor of atmospheric science at the University of Missouri
• Tad Murty, oceanographer; adjunct professor, Departments of Civil Engineering and Earth Sciences, University of Ottawa
• Tim Patterson, paleoclimatologist and professor of geology at Carleton University in Canada.
• Ian Plimer, professor emeritus of mining geology, the University of Adelaide.
• Arthur B. Robinson, American politician, biochemist and former faculty member at the University of California, San Diego
• Murry Salby, atmospheric scientist, former professor at Macquarie University and University of Colorado
• Nicola Scafetta, research scientist in the physics department at Duke University
• Tom Segalstad, geologist; associate professor at University of Oslo
• Nir Shaviv, professor of physics focusing on astrophysics and climate science at the Hebrew University of Jerusalem
• Fred Singer, professor emeritus of environmental sciences at the University of Virginia
• Willie Soon, astrophysicist, Harvard-Smithsonian Center for Astrophysics
• Roy Spencer, meteorologist; principal research scientist, University of Alabama in Huntsville
• Henrik Svensmark, physicist, Danish National Space Center
• George H. Taylor, retired director of the Oregon Climate Service at Oregon State University
• Jan Veizer, environmental geochemist, professor emeritus from University of Ottawa

Scientists arguing that the cause of global warming is unknown

These scientists have said that no principal cause can be ascribed to the observed rising temperatures, whether man-made or natural.

• Syun-Ichi Akasofu, retired professor of geophysics and founding director of the International Arctic Research Center of the University of Alaska Fairbanks. "[T]he method of study adopted by the IPCC is fundamentally flawed"
• Claude Allègre, French politician; geochemist, emeritus professor at Institute of Geophysics (Paris)."Various parameters appear more important than CO₂"
• Robert Balling, a professor of geography at Arizona State University. "[actual temperature changes are] not consistent with predictions from numerical climate models."
• Pål Brekke, solar astrophycisist, senior advisor Norwegian Space Centre. "Anyone who claims that the debate is over and the conclusions are firm has a fundamentally unscientific approach"
• John Christy, professor of atmospheric science and director of the Earth System Science Center at the University of Alabama in Huntsville, contributor to several IPCC reports. "I see neither the developing catastrophe nor the smoking gun proving that human activity is to blame"
• Petr Chylek, space and remote sensing sciences researcher, Los Alamos National Laboratory. "Carbon dioxide should not be considered as a dominant force behind the current warming"
• David Deming, geology professor at the University of Oklahoma. "it would be foolish to establish national energy policy on the basis of misinformation and irrational hysteria"
• Vincent R. Gray, New Zealand physical chemist with expertise in coal ashes "The Global Warming Scam"
• Keith E. Idso, botanist, former adjunct professor of biology at Maricopa County Community College District and the vice president of the Center for the Study of Carbon Dioxide and Global Change "there is no compelling reason to believe that the rise in temperature was caused by the rise in CO2"
• Kary Mullis, 1993 Nobel Laureate in Chemistry. "On AIDS and Global Warming"
• Antonino Zichichi, emeritus professor of nuclear physics at the University of Bologna and president of the World Federation of Scientists. "it is not possible to exclude the idea that climate changes can be due to natural causes"

Scientists arguing that global warming will have few negative consequences

These scientists have said that projected rising temperatures will be of little impact or a net positive for society or the environment.

• Indur M. Goklany, science and technology policy analyst for the United States Department of the Interior
• Craig D. Idso, faculty researcher, Office of Climatology, Arizona State University and founder of the Center for the Study of Carbon Dioxide and Global Change
• Sherwood B. Idso, former research physicist, USDA Water Conservation Laboratory, and adjunct professor, Arizona State University
• Patrick Michaels, senior fellow at the Cato Institute and retired research professor of environmental science at the University of Virginia

Deceased scientists

This section includes deceased scientists who would otherwise be listed in the prior sections.

• August H. "Augie" Auer Jr. (1940–2007), retired New Zealand MetService meteorologist and past professor of atmospheric science at the University of Wyoming
• Reid Bryson (1920–2008), emeritus professor of atmospheric and oceanic sciences, University of Wisconsin-Madison.
• Robert M. Carter (1942–2016), former head of the School of Earth Sciences at James Cook University
• William M. Gray (1929–2016), professor emeritus and head of the Tropical Meteorology Project, Department of Atmospheric Science, Colorado State University
• Robert Jastrow (1925–2008), American astronomer, physicist, cosmologist and leading NASA scientist who, together with Fred Seitz and William Nierenberg, established the George C. Marshall Institute
• Harold ("Hal") Warren Lewis (1923–2011), emeritus professor of physics and former department chairman at the University of California, Santa Barbara.
• Frederick Seitz (1911–2008), solid-state physicist, former president of the National Academy of Sciences and co-founder of the George C. Marshall Institute in 1984.

See also

• Environmental skepticism
• Global warming controversy
  • Climate change denial
  • Global warming conspiracy theory
  • Hockey stick controversy
• List of authors from the IPCC AR4 WGI report
• List of climate scientists
• Merchants of Doubt
• Oregon Petition

External links

• Intergovernmental Panel on Climate Change (IPCC) — Consensus, mainstream assessment of climate change
• Nongovernmental International Panel on Climate Change (NIPCC) — Compilation of some non-consensus views and study references