Since taking office, the George W. Bush administration has consistently sought to undermine the public’s understanding of the view held by the vast majority of climate scientists that human-caused emissions of carbon dioxide and other heat-trapping gases are making a discernible contribution to global warming.

After coming to office, the administration asked the National Academy of Sciences (NAS) to review the findings of the Intergovernmental Panel on Climate Change (IPCC) and provide further assessment of what climate science could say about this issue. The NAS panel rendered a strong opinion, which, in essence, confirmed that of the IPCC. The American Geophysical Union, t...

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