And where do you suppose the Hydrogen will come from when the Oil runs out, with current hydrogen production coming as a waste product in oil refining? Cracking water I here you ask? Where are you going to get the energy for the electro-chemical cells to do that on a mass scale? Sure the zero emissions are great, but the real goal is high storage batteries with higher output at a lower mass then is currently available... how this will happen I don't know... but it's the only real 'clean' direction without resorting to backward technology like solar and wind.