In 1977, the Kochs provided the funds to launch the nation’s first libertarian think tank, the Cato Institute. According to the Center for Public Integrity, between 1986 and 1993 the Koch family gave eleven million dollars to the institute. Today, Cato has more than a hundred full-time employees, and its experts and policy papers are widely quoted and respected by the mainstream media. It describes itself as nonpartisan, and its scholars have at times been critical of both parties. But it has consistently pushed for corporate tax cuts, reductions in social services, and laissez-faire environmental policies.
When President Obama, in a 2008 speech, described the science on global warming as “beyond dispute,” the Cato Institute took out a full-page ad in the Times to contradict him. Cato’s resident scholars have relentlessly criticized political attempts to stop global warming as expensive, ineffective, and unnecessary. Ed Crane, the Cato Institute’s founder and president, told me that “global-warming theories give the government more control of the economy.”

Cato scholars have been particularly energetic in promoting the Climategate scandal. Last year, private e-mails of climate scientists at the University of East Anglia, in England, were mysteriously leaked, and their exchanges appeared to suggest a willingness to falsify data in order to buttress the idea that global warming is real. In the two weeks after the e-mails went public, one Cato scholar gave more than twenty media interviews trumpeting the alleged scandal. But five independent inquiries have since exonerated the researchers, and nothing was found in their e-mails or data to discredit the scientific consensus on global warming.
Nevertheless, the controversy succeeded in spreading skepticism about climate change. Even though the National Oceanic and Atmospheric Administration recently issued a report concluding that the evidence for global warming is unequivocal, more Americans are convinced than at any time since 1997 that scientists have exaggerated the seriousness of global warming. The Kochs promote this statistic on their company’s Web site but do not mention the role that their funding has played in fostering such doubt.

In a 2002 memo, the Republican political consultant Frank Luntz wrote that so long as “voters believe there is no consensus about global warming within the scientific community” the status quo would prevail. The key for opponents of environmental reform, he said, was to question the science—a public-relations strategy that the tobacco industry used effectively for years to forestall regulation. The Kochs have funded many sources of environmental skepticism, such as the Heritage Foundation, which has argued that “scientific facts gathered in the past 10 years do not support the notion of catastrophic human-made warming.” The brothers have given money to more obscure groups, too, such as the Independent Women’s Forum, which opposes the presentation of global warming as a scientific fact in American public schools. Until 2008, the group was run by Nancy Pfotenhauer, a former lobbyist for Koch Industries. Mary Beth Jarvis, a vice-president of a Koch subsidiary, is on the group’s board.

Naomi Oreskes, a professor of history and science studies at the University of California, San Diego, is the co-author of “Merchants of Doubt,” a new book that chronicles various attempts by American industry to manipulate public opinion on science. She noted that the Kochs, as the heads of “a company with refineries and pipelines,” have “a lot at stake.” She added, “If the answer is to phase out fossil fuels, a different group of people are going to be making money, so we shouldn’t be surprised that they’re fighting tooth and nail.”
David Koch told New York that he was unconvinced that global warming has been caused by human activity. Even if it has been, he said, the heating of the planet will be beneficial, resulting in longer growing seasons in the Northern Hemisphere. “The Earth will be able to support enormously more people because far greater land area will be available to produce food,” he said.