Better enforcement of existing environmental standards would be a start toward reduction of carbon emissions from coal-fired electric power plants.
The United States government is in the early stages of crafting the nation's first carbon cap-and-trade law. The House Committee on Energy and Commerce released a white paper detailing the scope of the carbon law and one thing is already very clear: drivers won't be regulated directly because there are just too many of us! You can read the entire 22 page white page pdf here. Transportation is discussed on page 13 of the white paper. Here is exactly how the white paper explains why regulating individual drivers won't work.