Questions about research slow climate change efforts

STATE COLLEGE, Pa. — The violent threats are not what bother Michael Mann the most. He's used to them.

Instead, it's the fact that his life's work — the effort to stop global warming — has been under siege since last fall. That's when Mann suddenly found himself in the middle of the so-called "climategate" scandal, in which more than 1,000 e-mails among top climate scientists — including Mann — were obtained illegally by hackers and published on the Internet.

The e-mails showed some of the scientists sharing doubts about just how fast the Earth's temperature is rising, questioning the work of other researchers and refusing to share data with the public. Critics, including Sen. James Inhofe, R-Okla., have seized on the e-mails as proof that Mann and his colleagues deliberately exaggerated the scientific case behind global warming.

In a rare extended interview, Mann acknowledges "minor" errors but says he has been bewildered by the criticism — including a deluge of correspondence sent to his Pennsylvania State University office that, he says, occasionally has turned ugly.

"I've developed a thick skin," Mann says. "Frankly, I'm more worried that these people are succeeding in creating doubt in the minds of the public, when there really shouldn't be any."

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Indeed, the controversy has contributed to a fundamental shift in efforts to stop global warming, forcing environmentalists to scale down long-held ambitions and try to win back an increasingly skeptical American public. Walter Russell Mead of the Council on Foreign Relations, a New York-based think tank, says recent events may be causing "the death of the global warming movement as we know it."

Others don't go quite that far, but there have been setbacks:

• Citing doubts raised by the "climategate" e-mails, state governments in Texas, Virginia and Alabama filed legal challenges last month to stop the federal government from regulating carbon dioxide, a greenhouse gas. The challenges could force the Obama administration to modify or abandon its plans to regulate carbon emissions from factories and vehicles.

• Senate Democrats including John Kerry of Massachusetts have set aside House legislation that would limit greenhouse gas emissions from factories and other businesses nationwide. They are pursuing a new bill that may instead focus on utility companies, Kerry says.

• After more than a decade of fruitless efforts to negotiate a binding global treaty to cut greenhouse gas emissions, culminating in last December's summit in Copenhagen, the USA may now pursue a more narrow strategy, State Department climate change envoy Todd Stern said last month. He said future talks might be limited to a smaller group of major polluters such as the USA and China — and leave out small countries that blocked a deal at Copenhagen, such as Sudan.

• The United Nations announced Wednesday that it would bring in an outside panel of scientists to help review an occasional study put together by a U.N. body, the Intergovernmental Panel on Climate Change (IPCC). The study was regarded as the gold standard of climate science until several errors came to light this year.