The Bush administration probably wouldn't spend so much time obfuscating greenhouse gas regulation if it knew Congressional Democrats were just as willing to do the job.
Rep. Rick Boucher (D-VA) is pushing legislation which would forbid states from regulating greenhouse gas emissions from vehicles. The proposal would, as The Washington Post put it today, "kneecap" the effort of 12 states to institute their own program. Under the Clean Air Act, those states need EPA to grant them a waiver in order to begin regulating. The proposal removes EPA's authority to grant those waivers.