Maybe gasoline is not so bad after all.

[420SEL]

http://www.cnn.com/2003/TECH/science/06/12/hydrogen.ozone.ap/index.html

I like how the only argument against this has been that hydrogen leaks will not be as bad as predicted, just like oil spills have not been as bad as projected, or halon leaks (the airbase I grew up on used to have a mjor halon leak about twice a year and they only started being reported in the late 90s when everyone was more environmentally aware).