gollum123 writes: "California is suing the US federal government, in an attempt to force car makers to conform to tougher cuts in greenhouse gas emissions ( http://news.bbc.co.uk/2/hi/americas/7169200.stm ). The lawsuit comes after the federal Environmental Protection Agency denied California a waiver from US law needed to enact its own efficiency targets. Fifteen other states or state agencies are set to join the action. It challenged the Epa's denial of California's request to implement its own emissions law — which would require a 30% reduction in motor vehicle greenhouse gas emissions by 2016 by improving fuel efficiency standards. For years, California has been allowed to set its own environmental targets in recognition of the "compelling and extraordinary conditions" the state faces — and the Epa has never before denied California a waiver request. The other states joining the fight are: Massachusetts, Arizona, Connecticut, Delaware, Illinois, Maine, Maryland, New Jersey, New Mexico, New York, Oregon, Pennsylvania Department of Environmental Protection, Rhode Island, Vermont and Washington."