Natural gas seems to be the solution in the short term. It seems like it's the closest resource that has an existing infrastructure that would just need to be upgraded.
I've done some research on which company out there that has a kit that you can use to convert you car over to natural gas. The one that definitely has the best track record is Galileo out of Argentina - the country that really uses natural gas and has it figured out.
CNGOutfitters.com has kits directly from them, they also have DOT tanks and installation as well. Change the world, change your fuel!