Climate Change Debunked? Not So Fast | Space.com

New research suggesting that cloud cover, not carbon dioxide, causes global warming is getting buzz in climate skeptic circles. But mainstream climate scientists dismissed the research as unrealistic and politically motivated.

"It is not newsworthy," Daniel Murphy, a National Oceanic and Atmospheric Administration (NOAA) cloud researcher, wrote in an email to LiveScience.
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"He's taken an incorrect model, he's tweaked it to match observations, but the conclusions you get from that are not correct," Andrew Dessler, a professor of atmospheric sciences at Texas A&M University, said of Spencer's new study.
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Spencer sees it differently. He thinks that the whole cycle starts with the clouds. In other words, random increases in cloud cover cause climate warming. The cloud changes are caused by "chaos in the climate system," Spencer told LiveScience.
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The study finds a mismatch between the month-to-month variations in temperature and cloud cover in models versus the real world over the past 10 years, said Gavin Schmidt, a NASA Goddard climatologist. "What this mismatch is due to — data processing, errors in the data or real problems in the models — is completely unclear."
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"I cannot believe it got published," said Kevin Trenberth, a senior scientist at the National Center for Atmospheric Research.

Several researchers expressed frustration that the study was attracting media attention.

"If you want to do a story then write one pointing to the ridiculousness of people jumping onto every random press release as if well-established science gets dismissed on a dime," Schmidt said. "Climate sensitivity is not constrained by the last two decades of imperfect satellite data, but rather the paleoclimate record."

Spencer agreed that his work could not disprove the existence of manmade global warming. But he dismissed research on the ancient climate, calling it a "gray science."
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Dessler, the A&M climatologist said that he doubted the research would shift the political debate around global warming.

"It makes the skeptics feel good, it irritates the mainstream climate science community, but by this point, the debate over climate policy has nothing to do with science," Dessler said. "It's essentially a debate over the role of government," surrounding issues of freedom versus regulation.