Anatomy of Climate Lie

It's behind the curtain of New York Times Select, but Paul Krugman's latest column is an insightful dissection of one emblematic case of disinformation used to obscure the evidence of global warming.

NASA climatologist James Hansen is introduced in Al Gore's "An Inconvenient Truth."

Dr. Hansen was one of the first climate scientists to say publicly that global warming was under way. In 1988, he made headlines with Senate testimony in which he declared that "the greenhouse effect has been detected, and it is changing our climate now." When he testified again the following year, officials in the first Bush administration altered his prepared statement to downplay the threat. Mr. Gore's movie shows the moment when the administration's tampering was revealed.

Krugman fleshes out more of Mr. Hansen's story and demonstrates how far energy companies are willing to go to disinform the public about hard science.

But soon after Dr. Hansen's 1988 testimony, energy companies began a campaign to create doubt about global warming, in spite of the increasingly overwhelming evidence. And in the late 1990's, climate skeptics began a smear campaign against Dr. Hansen himself.

Leading the charge was Patrick Michaels, a professor at the University of Virginia who has received substantial financial support from the energy industry. In Senate testimony, and then in numerous presentations, Dr. Michaels claimed that the actual pace of global warming was falling far short of Dr. Hansen's predictions. As evidence, he presented a chart supposedly taken from a 1988 paper written by Dr. Hansen and others, which showed a curve of rising temperatures considerably steeper than the trend that has actually taken place.

In fact, the chart Dr. Michaels showed was a fraud — that is, it wasn't what Dr. Hansen actually predicted. The original paper showed a range of possibilities, and the actual rise in temperature has fallen squarely in the middle of that range. So how did Dr. Michaels make it seem as if Dr. Hansen's prediction was wildly off? Why, he erased all the lower curves, leaving only the curve that the original paper described as being "on the high side of reality."

The experts at www.realclimate.org, the go-to site for climate science, suggest that the smears against Dr. Hansen "might be viewed by some as a positive sign, indicative of just how intellectually bankrupt the contrarian movement has become." But I think they're misreading the situation. In fact, the smears have been around for a long time, and Dr. Hansen has been trying to correct the record for years. Yet the claim that Dr. Hansen vastly overpredicted global warming has remained in circulation, and has become a staple of climate change skeptics, from Michael Crichton to Robert Novak.

It is just this kind of distortion that has allowed energy companies and their front men in political office to perpetuate the myth that global warming is still debatable and unproven. Pioneers like Dr. Hansen have been sacrificed on the altar of political expediency. Meanwhile, the planet keeps getting warmer.