I have a couple of ideas:
First, give the big three a Gov. contract to produce all the Country, State and County vehicles and make them all run on hydrogen.
Second impose a tariff on hydrogen vehicles coming from the asian or european markets.
Third, in order to help subsidize this project, freeze all of OPEC's importation and have them eat their oil for about 15 or 20 years. Charge the oil companies a energy tax on their profits for the past 5-6 years and flood the market with our oil surplus we have in LA and TX.