The children now love luxury. They have bad manners, contempt for authority; they show disrespect for elders and love chatter in place of exercise.”
- 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.
- Ivar Giaever, Norwegian–American physicist and Nobel laureate in physics (1973).
- 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.
- Ross McKitrick, Professor of Economics and CBE Chair in Sustainable Commerce, University of Guelph.
- 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.
- Roger A. Pielke, Jr., professor of environmental studies at the Center for Science and Technology Policy Research at the University of Colorado at Boulder.
- 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.
- 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.
- 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.
- Claude Allègre, French politician; geochemist, emeritus professor at Institute of Geophysics (Paris).
- Robert Balling, a professor of geography at Arizona State University.
- Pål Brekke, solar astrophycisist, senior advisor Norwegian Space Centre.
- 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.
- Petr Chylek, space and remote sensing sciences researcher, Los Alamos National Laboratory.
- David Deming, geology professor at the University of Oklahoma.
- Vincent R. Gray, New Zealand physical chemist with expertise in coal ashes
- 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
- Antonino Zichichi, emeritus professor of nuclear physics at the University of Bologna and president of the World Federation of Scientists.
- Kary Mullis, 1993 Nobel Laureate in Chemistry.
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
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.
Marjorie McGuirk it also says Dr. William A. Nierenberg, a geophysicist who is director emeritus of the Scripps Institution and who has expressed doubt that global warming will be as severe as some scientists have predicted. A number of feedbacks might act to limit global warming, he said. “In fact,” he said, “the average global temperature change could be almost zero” because of the many feedback mechanisms. But the operation of the mechanisms could nevertheless impose a “severe” price in terms of the regional climate changes they would cause.
It goes on to say
Some scientists say the Ramanathan-Collins findings could lead to better predictions about the extent of the expected global warming. The predictions rest largely on computerized mathematical models of the climate system that all scientists agree are crude and flawed. One of the major flaws has to do with the effect of clouds.