California is threatening to sue the U.S. EPA for obstructionism. You'll recall that the U.S. Supreme Court recently ruled decisively that CO2 is a pollutant under the Clean Air Act, and that implementing restrictions on vehicle CO2 emissions does not abrogate the DOT's authority to set fuel-efficiency standards. That ruling pretty well destroys the legal basis for the lawsuits automakers have filed against Calif. and other states adopting tough vehicle emissions st ...