Scientists questioning the accuracy of IPCC climate projections
Scientists in this section have made comments 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.
Freeman Dyson, [COLOR="#0000FF"]professor emeritus[/COemeritusLOR] of the School of Natural Sciences, Institute for Advanced Study; Fellow of the Royal Society [10]
Richard Lindzen, Alfred P. Sloan professor of atmospheric science at the Massachusetts Institute of Technology and member of the National Academy of Sciences[11]
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), and author of books supporting the validity of dowsing[12]
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 ANU[13]
Philip Stott,
professor emeritus of biogeography at the University of London[14]
Hendrik Tennekes,
retired director of research, Royal Netherlands Meteorological Institute [15]
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.[16]
Scientists in this section have made comments that the observed warming is more likely 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, mathematician and astronomer at Pulkovo Observatory of the Russian Academy of Sciences[17]
Sallie Baliunas, astronomer, Harvard-Smithsonian Center for Astrophysics[18][19]
Ian Clark, hydrogeologist, professor, Department of Earth Sciences, University of Ottawa[20]
Chris de Freitas, associate professor, School of Geography, Geology and Environmental Science, University of Auckland[21]
David Douglass, solid-state physicist, professor, Department of Physics and Astronomy, University of Rochester[22]
Don Easterbrook,
emeritus professor of geology, Western Washington University[23]
William M. Gray,
professor emeritus and head of the Tropical Meteorology Project, Department of Atmospheric Science, Colorado State University[24]
William Happer, physicist specializing in optics and spectroscopy, Princeton University[25]
William Kininmonth, meteorologist, former Australian delegate to World Meteorological Organization Commission for Climatology[26]
David Legates, associate professor of geography and director of the Center for Climatic Research, University of Delaware[27]
Tad Murty, oceanographer; adjunct professor, Departments of Civil Engineering and Earth Sciences, University of Ottawa[28]
Tim Patterson, paleoclimatologist and professor of geology at Carleton University in Canada.[29][30]
Ian Plimer,
professor emeritus of Mining Geology, the University of Adelaide.[31]
Nicola Scafetta, research scientist in the physics department at Duke University[32][33]
Tom Segalstad, head of the Geology Museum at the University of Oslo[34]
Fred Singer,
professor emeritus of environmental sciences at the University of Virginia[35][36][37]
Willie Soon, astrophysicist, Harvard-Smithsonian Center for Astrophysics[38]
Roy Spencer, principal research scientist, University of Alabama in Huntsville[39]
Henrik Svensmark, Danish National Space Center[40]
Jan Veizer, environmental geochemist,
professor emeritus from University of Ottawa[41]
Scientists arguing that the cause of global warming is unknown
Scientists in this section have made comments that no principal cause can be ascribed to the observed rising temperatures, whether man-made or natural. Their views on climate change are usually described in more detail in their biographical articles.
Syun-Ichi Akasofu,
retired professor of geophysics and founding director of the International Arctic Research Center of the University of Alaska Fairbanks[42]
Claude Allègre,
politician; geochemist, Institute of Geophysics (Paris)[43]
Robert C. Balling, Jr., a professor of geography at Arizona State University[44]
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[45][46]
Petr Chylek, space and remote sensing sciences researcher, Los Alamos National Laboratory[47]
Judith Curry, chair of the School of Earth and Atmospheric Sciences at the Georgia Institute of Technology[48]
David Deming, geology professor at the University of Oklahoma[49]
Antonino Zichichi,
emeritus professor of nuclear physics at the University of Bologna and president of the World Federation of Scientists[50]
Scientists arguing that global warming will have few negative consequences
Scientists in this section have made comments that projected rising temperatures will be of little impact or a net positive for human society and/or the Earth's environment. Their views on climate change are usually described in more detail in their biographical articles.
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 [51]
Sherwood Idso, former research physicist, USDA Water Conservation Laboratory, and adjunct professor, Arizona State University[52]
Patrick Michaels, senior fellow at the Cato Institute and
retired research professor of environmental science at the University of Virginia[53]
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