The Bush Administration has run a systematic campaign to play down the dangers of climate change, demanding hundreds of politically motivated changes to scientific reports and muzzling a pre-eminent expert on global warming, the US Congress has been told. The testimony ... painted the Administration as determined to maintain its line on climate change even when it clashed with the findings of scientific experts. The Administration has moved to exercise control over environmental agencies by installing political appointees including a former oil industry lobbyist, Philip Cooney, as chief of staff of the Council on Environmental Quality. In 2003 Mr Cooney and other senior appointed officials made at least 181 changes to a strategic plan on climate change to play down the scientific consensus on global warming. They made a further 113 alterations to minimise the human role in climate change. These changes must be made," a note in Mr Cooney's handwriting says. Under heated questioning, Mr Cooney admitted the changes were all intended to cast doubt on the impact of global warming. Control from the White House became the norm, [NASA's Dr. James] Hansen told the committee. "Scientific press releases were going to the White House for editing," he said. "It's very unfortunate that we developed this politicisation of science. The public relations office should be staffed by expert appointees - otherwise they become offices of propaganda." Hansen was also restrained from giving press interviews by a junior political appointee, George Deutsch. Mr Deutsch left NASA early last year after it emerged he had falsified his CV.

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