In 2007, the most comprehensive report to date on global warming, issued by the respected United Nations Intergovernmental Panel on Climate Change, made a shocking claim: The Himalayan glaciers could melt away as soon as 2035.
These glaciers provide the headwaters for Asia's nine largest rivers and lifelines for the more than one billion people who live downstream. Melting ice and snow would create mass flooding, followed by mass drought. The glacier story was reported around the world. Last December, a spokesman for the World Wildlife Fund, an environmental pressure group, warned, "The deal reached at Copenhagen will have huge ramifications for the lives of hundreds of millions of people who are already highly vulnerable due to widespread poverty." To dramatize their country's plight, Nepal's top politicians strapped on oxygen tanks and held a cabinet meeting on Mount Everest.
But the claim was rubbish, and the world's top glaciologists knew it. It was based not on rigorously peer-reviewed science but on an anecdotal report by the WWF itself. When its background came to light on the eve of Copenhagen, Rajendra Pachauri, the head of the IPCC, shrugged it off. But now, even leading scientists and environmental groups admit the IPCC is facing a crisis of credibility that makes the Climategate affair look like small change.
The impetus for the Copenhagen conference was that the science makes it imperative for us to act. But even if that were true and even if we knew what to do a global deal was never in the cards. As Mr. Mead writes, "The global warming movement proposed a complex set of international agreements involving vast transfers of funds, intrusive regulations in national economies, and substantial changes to the domestic political economies of most countries on the planet." Copenhagen was never going to produce a breakthrough. It was a dead end.
And now, the science scandals just keep on coming. First there was the vast cache of e-mails leaked from the University of East Anglia, home of a crucial research unit responsible for collecting temperature data. Although not fatal to the science, they revealed a snakepit of scheming to keep contradictory research from being published, make imperfect data look better, and withhold information from unfriendly third parties. If science is supposed to be open and transparent, these guys acted as if they had a lot to hide.
Despite widespread efforts to play down the Climategate e-mails, they were very damaging. An investigation by the British newspaper The Guardian among the most aggressive advocates for action on climate change has found that a series of measurements from Chinese weather stations were seriously flawed, and that documents relating to them could not be produced.
Meantime, the IPCC the body widely regarded, until now, as the ultimate authority on climate science is looking worse and worse. After it was forced to retract its claim about melting glaciers, Mr. Pachauri dismissed the error as a one-off. But other IPCC claims have turned out to be just as groundless.
For example, it warned that large tracts of the Amazon rain forest might be wiped out by global warming because they are extremely susceptible to even modest decreases in rainfall. The sole source for that claim, reports The Sunday Times of London, was a magazine article written by a pair of climate activists, one of whom worked for the WWF. One scientist contacted by the Times, a specialist in tropical forest ecology, called the article "a mess." ...