The question begging an answer is this: where will the hydrogen come from? I quite understand the use of Hydrogen as an energy transfer mechanism ; theoretically, when all fossil fuels have run out and we still need internal combustion fuel (makes a lot of sense alright), energy coming from nuclear/wind/solar power will be used to produce Hydrogen that will power internal combustion engines. However it's a fact that producing Hydrogen from electrolysis of water like we all did in Junior High science lab is commercially unfeasible because it's just too expensive. The way they're doing it now is by breaking up methane and simple hydrocarbons. So not only does this still result in CO2 being released into the atmosphere, IT STILL RELIES CHIEFLY ON FOSSIL FUELS!! Not to mention the very high delivery and handling cost of something at nearly 0 Kelvin temperatures, and the fact that because Hydrogen atoms are the smallest in existence, they will, given enough time, seep through anything, even a 2-inch-thick steel barrier.

I sincerely applaud BMW's hard work to get alternative fuel technology off the ground, I just think that this time they scored a goal for their team, only they were playing the wrong match.