Dr. Will Happer, Emeritus Professor of Physics at Princeton University: 'Aside from the human brain, the climate is the most complex thing on the planet. The number of factors that influence climate—the sun, the earth’s orbital properties, oceans, clouds, and, yes, industrial man—is huge and enormously variable. For the purposes of illustration, let’s just focus our attention on water. The earth is essentially a water planet. A major aspect of climate involves the complicated interaction between two very turbulent fluids: the atmosphere, which holds large amounts of water (think rain and snow), and the oceans, which cover fully 70% of the earth’s surface. We can’t predict what effect the atmosphere is going to have on future temperatures because we can’t predict cloud formations. And the convection of heat, oxygen, salt and other quantities that pass through the oceans, not to mention weather cycles like El Niño in the tropical Pacific, make predicting ocean temperatures an equally difficult business. We can’t predict either side of the atmosphere/ocean equation. But we can say this with certainty: Water—in all its phases—has huge effects on atmospheric heating and cooling. Compared to water—H20, carbon dioxide—CO2—is a minor contributor to the warming of the earth.'
Happer: 'So, if they want to show that the earth’s temperature at the end of the century will be two degrees centigrade higher than it is now, they put in the numbers that produce that result. That’s not science. That’s science fiction.'
University of Exeter rules out high-end temperature increases
The research also has implications for the climate-change movement, said University of Colorado Boulder professor Roger A. Pielke Jr.: “If your climate advocacy is grounded in ‘[it’s] gonna be bad, really bad’ arguments, then new science (‘not as bad’) puts you in an awkward position,” he said on Twitter. “No doubt some catastrophists will today feel a need to diss the new study lest they give evil deniers due.” - "Clever new climate change study. Not as bad as has been projected. That is good news. Right?"