Arguably the coolest zero-emission vehicle

designed thus far has been unveiled by BMW at the Paris auto show:

German luxury carmaker BMW unveiled the world's fastest hydrogen-powered car, dubbed the H2R, at the Paris auto show on September 22, 2004. The car is capable of exceeding 185 miles per hour. Unlike most hydrogen-powered vehicles, the H2R doesn't operate on a fuel cell but rather uses a modified 6-liter, 12-cylinder combustion engine for its propulsion that essentially emits nothing but steam.

Now if only someone could come up with a zero-emission way to produce hydrogen, we would be in business. (Via Slashdot)