EPA can regulate CO2 emissions

The U.S. Supreme Court ruled 5-4 that the EPA does have the authority to regulate carbon dioxide as a pollutant, particularly for cars. The EPA and some states had argued they had no business doing so. This sets the stage for the U.S. to begin to reduce our CO2 emissions, a contributor to climate change, but probably not until Bush's presidency (the long nightmare) is over.

In the meantime, this Friday, the Intergovernmental Panel on Climate Change (IPCC) will be issuing the second report on climate change. This one is specific toward discussing the impacts from climate change.
James McCarthy, a renown oceanographer and house master of Phorzheimer House at Harvard University, was quoted as saying the more extreme impacts probably wouldn't happen, as we would get a handle on the problems - we're not that stupid. Your opinion?