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Hydrogen cars are still in their infancy, but that hasn't stopped anyone from building working prototypes. While they're not selling to the public just let (I would think availability of hydrogen filling stations might be a problem), it'll be a great day when we can get high performance cars whose only emissions are water vapor and heat! Below is the hydrogen-powered Ford Focus FCV hybrid concept car.

Possibly the last type of car you'd expect to be environmentally friendly is the Hummer. But believe it or not, there is now a hydrogen-powered Hummer called the H2H. Hummer had a special display compete with footage from California governor Arnold Schwarzenegger. While not intended for mass production, it's meant to spread the word about hydrogen benefits and future viability. (Note that the Hummer in the photo below is not the H2H.)