BMW has been seriously working on hydrgen for 20+ years. I remember reading a comparitive article on a 735i (Early 90's?) with a Petrol, Petrol/Hydrogen and Hydrogen car. The hydrogen was the best except for fuel consumption at roughly 30litres/100km! (Around 12-13mpg?)
I have always supported hydrogen as the future and I think the pollution factor could be minimised using hydro-electric power. You have your power generator and water supply all at the same place too. And there are natural processes that release hydrogen as well. But only in about 10-20 years I think. When oil reserves become scarce and oil prices insane.
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