The Supreme Court has ruled that the Environmental Protection Agency has the authority to regulate the emission of "greenhouse gases" linked to global warming. In a 5-4 decision, the court ruled that the EPA violated the Clean Air Act by improperly declining to regulate new-vehicle emissions standards to control the pollutants that scientists say contribute to global warming. We speak with New York Times environmental reporter, Andrew Revkin. [includes rush transcript]

It is the first high court decision in a case involving global warming and is seen a defeat for the Bush administration which has refused to view carbon dioxide as an air pollutant subject to EPA regulation.

• Andrew Revkin, award-winning science reporter with the New York Times. His latest book is titled "The North Pole Was Here: Puzzles and Perils at the Top of the World."