The Environmental Protection Agency has granted California's waiver request, thereby enabling the state to implement its greenhouse gas emission standards for new motor vehicles beginning with the current model year. Under the Clean Air Act, the decision also paves the way for other states to adopt and implement regulations as stringent as California's. EPA Administrator Jackson said, “This decision puts the law and science first. After review of the scientific findings, and another comprehensive round of public engagement, I have decided this is the appropriate course under the law.” California’s request for a waiver dates back to 2005, and was originally denied by the Bush administration in March 2008. The fact that EPA's issuing of the waiver is a change in the agency's position may lead courts to scrutinize the decision more closely if it is challenged.
For more information on the California waiver request go to: http://www.epa.gov/otaq/climate/ca-waiver.htm