Lets be honest folks… global warming or no global warming…
Would plug-in hybrids (cars that charged for 150 miles of use from your home outlet, and used a gasoline hybrid engine for long distance) reduce the amount of oil burned in the US? Yep. Would htat reduction be positive for the environment? Yep. Would it be good foreign policy also? Yep, less money going to Saudi, Venezuela, etc.
Would an increase in hydro and wind power, allowing for upgrades of existing coal plants that reduced emissions, even if not all the way to current standards, improve the environment? Yep.
Would mandatory re-refining of used oil reduce environmental damage and dependence on foreign oil? Yep.
It is the little shite folks. You correct small things for a large number of people, and the improvement is massive.
Will this stop global warming? probably not. If it is indeed happenning (and the actual temp data is inconclusive due to lack of long term accuracy and completeness), then it will take more than just the actions of 300,000,000 Americans to stop it.
BUT… are the things we need to do to slow or reduce POTENTIAL global warming also in the best interests of the united States as a whole, such as reducing oil consumption? Hell yes!