Ian Clark, hydrogeologist, professor, Department of Earth Sciences, University of Ottawa: "That portion of the scientific community that attributes climate warming to CO2 relies on the hypothesis that increasing CO2, which is in fact a minor greenhouse gas, triggers a much larger water vapour response to warm the atmosphere. This mechanism has never been tested scientifically beyond the mathematical models that predict extensive warming, and are confounded by the complexity of cloud formation – which has a cooling effect. ... We know that [the sun] was responsible for climate change in the past, and so is clearly going to play the lead role in present and future climate change. And interestingly... solar activity has recently begun a downward cycle."
David Douglass, solid-state physicist, professor, Department of Physics and Astronomy, University of Rochester: "The observed pattern of warming, comparing surface and atmospheric temperature trends, does not show the characteristic fingerprint associated with greenhouse warming. The inescapable conclusion is that the human contribution is not significant and that observed increases in carbon dioxide and other greenhouse gases make only a negligible contribution to climate warming.
Don Easterbrook, emeritus professor of geology, Western Washington University: "global warming since 1900 could well have happened without any effect of CO2. If the cycles continue as in the past, the current warm cycle should end soon and global temperatures should cool slightly until about 2035"
William M. Gray, Professor Emeritus and head of The Tropical Meteorology Project, Department of Atmospheric Science, Colorado State University and a familiar voice here in Florida: "This small warming is likely a result of the natural alterations in global ocean currents which are driven by ocean salinity variations. Ocean circulation variations are as yet little understood. Human kind has little or nothing to do with the recent temperature changes. We are not that influential.""I am of the opinion that [global warming] is one of the greatest hoaxes ever perpetrated on the American people."So many people have a vested interest in this global-warming thing—all these big labs and research and stuff. The idea is to frighten the public, to get money to study it more."
William Happer, physicist Princeton University: "all the evidence I see is that the current warming of the climate is just like past warmings. In fact, it's not as much as past warmings yet, and it probably has little to do with carbon dioxide, just like past warmings had little to do with carbon dioxide"
William Kininmonth, meteorologist, former Australian delegate to World Meteorological Organization Commission for Climatology: "There has been a real climate change over the late nineteenth and twentieth centuries that can be attributed to natural phenomena. Natural variability of the climate system has been underestimated by IPCC and has, to now, dominated human influences."
George Kukla, retired Professor of Climatology at Columbia University and Lamont-Doherty Earth Observatory, said in an interview: "What I think is this: Man is responsible for a PART of global warming. MOST of it is still natural."
David Legates, associate professor of geography and director of the Center for Climatic Research, University of Delaware: "About half of the warming during the 20th century occurred prior to the 1940s, and natural variability accounts for all or nearly all of the warming."
Tad Murty, oceanographer; adjunct professor, Departments of Civil Engineering and Earth Sciences, University of Ottawa: global warming "is the biggest scientific hoax being perpetrated on humanity. There is no global warming due to human anthropogenic activities. The atmosphere hasn’t changed much in 280 million years, and there have always been cycles of warming and cooling. The Cretaceous period was the warmest on earth. You could have grown tomatoes at the North Pole"
Tim Patterson, paleoclimatologist and Professor of Geology at Carleton University in Canada: "There is no meaningful correlation between CO2 levels and Earth's temperature over this [geologic] time frame. In fact, when CO2 levels were over ten times higher than they are now, about 450 million years ago, the planet was in the depths of the absolute coldest period in the last half billion years. On the basis of this evidence, how could anyone still believe that the recent relatively small increase in CO2 levels would be the major cause of the past century's modest warming?"
Ian Plimer, Professor emeritus of Mining Geology, The University of Adelaide: "We only have to have one volcano burping and we have changed the whole planetary climate... It looks as if carbon dioxide actually follows climate change rather than drives it".
Tom Segalstad, head of the Geology Museum at the University of Oslo: "The IPCC's temperature curve (the so-called 'hockey stick' curve) must be in error...human influence on the 'Greenhouse Effect' is minimal (maximum 4%). Anthropogenic CO2 amounts to 4% of the ~2% of the "Greenhouse Effect", hence an influence of less than 1 permil of the Earth's total natural 'Greenhouse Effect' (some 0.03°C of the total ~33°C).
Nir Shaviv, astrophysicist at the Hebrew University of Jerusalem: "[T]he truth is probably somewhere in between [the common view and that of skeptics], with natural causes probably being more important over the past century, whereas anthropogenic causes will probably be more dominant over the next century. ... [A]bout 2/3's (give or take a third or so) of the warming [over the past century] should be attributed to increased solar activity and the remaining to anthropogenic causes." His opinion is based on some proxies of solar activity over the past few centuries.
Fred Singer, Professor emeritus of Environmental Sciences at the University of Virginia: "The greenhouse effect is real. However, the effect is minute, insignificant, and very difficult to detect." “It’s not automatically true that warming is bad, I happen to believe that warming is good, and so do many economists.”
Willie Soon, astrophysicist, Harvard-Smithsonian Center for Astrophysics: "[T]here's increasingly strong evidence that previous research conclusions, including those of the United Nations and the United States government concerning 20th century warming, may have been biased by underestimation of natural climate variations. The bottom line is that if these variations are indeed proven true, then, yes, natural climate fluctuations could be a dominant factor in the recent warming. In other words, natural factors could be more important than previously assumed."
Roy Spencer, principal research scientist, University of Alabama in Huntsville: "I predict that in the coming years, there will be a growing realization among the global warming research community that most of the climate change we have observed is natural, and that mankind’s role is relatively minor"."
Philip Stott, professor emeritus of biogeography at the University of London: "...the myth is starting to implode. ... Serious new research at The Max Planck Society has indicated that the sun is a far more significant factor."
Henrik Svensmark, Danish National Space Center: "Our team ... has discovered that the relatively few cosmic rays that reach sea-level play a big part in the everyday weather. They help to make low-level clouds, which largely regulate the Earth’s surface temperature. During the 20th Century the influx of cosmic rays decreased and the resulting reduction of cloudiness allowed the world to warm up. ... most of the warming during the 20th Century can be explained by a reduction in low cloud cover."
Jan Veizer, environmental geochemist, Professor Emeritus from University of Ottawa: "At this stage, two scenarios of potential human impact on climate appear feasible: (1) the standard IPCC model ..., and (2) the alternative model that argues for celestial phenomena as the principal climate driver. ... Models and empirical observations are both indispensable tools of science, yet when discrepancies arise, observations should carry greater weight than theory. If so, the multitude of empirical observations favours celestial phenomena as the most important driver of terrestrial climate on most time scales, but time will be the final judge."
TOO EARLY TO TELL - THESE SCIENTISTS SAY
Syun-Ichi Akasofu, retired professor of geophysics and Founding Director of the International Arctic Research Center of the University of Alaska Fairbanks:
Claude Allègre, geochemist, Institute of Geophysics (Paris): "
Robert C. Balling, Jr.,
John Christy, professor of atmospheric science and director of the Earth System Science Center at the University of Alabama in Huntsville,
Petr Chylek, Space and Remote Sensing Sciences researcher, Los Alamos National Laboratory: "
William R. Cotton, Professor of Atmospheric Sciences at Colorado State University said in a presentation, "
David Deming, geology professor at the University of Oklahoma: "
Chris de Freitas, Associate Professor, School of Geography, Geology and Environmental Science, University of Auckland: "
Ross McKitrick, Assistant Professor in the Department of Economics at the University of Guelph, Ontario.
Rising temperatures will be of little impact
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 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: "
WOULD YOU LIKE TO REVISE YOUR B . . . . . . . T STATEMENT ABOUT UNANIMITY ON GLOBAL WARMING, BOB ?