Compressed Air Cars - Road trip anyone?!
Yes, compressed air is not as efficient as batteries. But batteries are dirty and cost a lot!
Get solar panels and drive one of these compressed air cars by 2010!
http://en.wikipedia.org/wiki/Air_vehicle
http://www.youtube.com/watch?v=QmqpGZv0YT4
http://zeropollutionmotors.us
http://www.popularmechanics.com/automotive/new_cars/4217016.html