Multiple states and environmental groups filed suit today against the U.S. Environmental Protection Agency which would force the EPA to write new regulations regarding carbon dioxide emissions from motor vehicles.  The lawsuit comes on the year anniversary of the Supreme Court ruling on Massachusetts v. Environmental Protection Agency.  The lawsuit would require the EPA to issue a determination on whether carbon dioxide affects human health within 60 days.  If they deem CO2 is harmful to public health, the EPA would be required to create a regulatory framework for controlling CO2 from motor vehicles based on the Supreme Court ruling from a year ago.