According to this AP article carried by CNN.com, The Science Academies of the G-8 countries issued a joint call for prompt action to reduce greenhouse gases saying that further delays will prove very costly. "Lord May, president of Britain's Royal Society, said in releasing the statement that U.S. President George W. Bush's policy on climate change was "misguided" and ignored scientific evidence." Further snippets:
"The Bush administration has consistently refused to accept the advice of the U.S. National Academy of Sciences. The NAS concluded in 1992 that, 'Despite the great uncertainties, greenhouse warming is a potential threat sufficient to justify action now,' by reducing emissions of greenhouse gases.
"Getting the U.S. onboard is critical because of the sheer amount of greenhouse gas emissions they are responsible for. For example, the Royal Society calculated that the 13 percent rise in greenhouse gas emissions from the U.S. between 1990 and 2002 is already bigger than the overall cut achieved if all the other parties to the Kyoto Protocol reach their targets."
The statement signed by the academies said evidence of global warming included "direct measurements of rising surface air temperatures and subsurface ocean temperatures and from phenomena such as increases in average global sea levels, retreating glaciers, and changes to many physical and biological systems."