Many climate scientists state that they are put under enormous pressure to distort or hide any scientific results which suggest that human activity is to blame for global warming. A survey of climate scientists which was reported to the US House Oversight and Government Reform Committee noted that "Nearly half of all respondents perceived or personally experienced pressure to eliminate the words 'climate change', 'global warming' or other similar terms from a variety of communications". These scientists were pressured to tailor their reports on global warming to fit the Bush administration's climate change scepticism. In some cases, this occurred at the request of a former oil-industry lobbyist.[214] In June 2008, a report by NASA's Office of the Inspector General concluded that NASA staff appointed by the White House had censored and suppressed scientific data on global warming in order to protect the Bush administration from controversy close to the 2004 presidential election.[215]
U.S. officials, such as Philip Cooney, have repeatedly edited scientific reports from US government scientists,[216] many of whom, such as Thomas Knutson, have been ordered to refrain from discussing climate change and related topics.[217][218][219] Attempts to suppress scientific information on global warming and other issues have been described by journalist Chris Mooney in his book The Republican War on Science.
Climate scientist James E. Hansen, director of NASA's Goddard Institute for Space Studies, wrote in a widely cited New York Times article[220] in 2006 that his superiors at the agency were trying to "censor" information "going out to the public". NASA denied this, saying that it was merely requiring that scientists make a distinction between personal, and official government, views in interviews conducted as part of work done at the agency. Several scientists working at the National Oceanic and Atmospheric Administration have made similar complaints;[221] once again, government officials said they were enforcing long-standing policies requiring government scientists to clearly identify personal opinions as such when participating in public interviews and forums.
The BBC's long-running current affairs series Panorama recently investigated the issue, and was told that "scientific reports about global warming have been systematically changed and suppressed".[222]