DUDE, did you see the Mercedes hydrogen fuel cell prototype on PBS this week? A remarkable car. It does not actually burn the hydrogen, it sprays a hydroxide on a chemically coated plate, the reaction causes the plate to emit an electric current, and the hydroxide is coverted to water in the reaction, and water goes out the tailpipe as the only emission. The "engine" is actually in the floor pan of the car, and is about 11" thick. Given the environmental costs and the rising fuel costs, we should have a national effort to pursue this kind of technology here in America.