I have been watching about this and hope hydrogen fuel cells never happen at least thats my view right now. Electric cars seem the best way to power the world with solar cells on homes as main fuel source not coal. For bigger vehicles and aircraft, hydrogen cells seem to be important however from what i read and after watching "Who Killed the Electric Car?" I think its another 15-30 years until the hydrogen fuel cell.
Let me know if I am on track I really have a naive view on this field.
cheers and welcome to the forum