I don't have time to look into it right now but my big question is what's the net energy output for hydrogen? Do we put in 1kW to get 0.8kW of hydrogen energy? If so, then we're in the same spot as we are with ethanol. Ethanol production has a terrible energy conversion ratio. I suspect that hydrogen is similar. even if our cars are cleaner then we're just moving the emission source one step up the ladder (more coal burned at the power plant) and going from one non-renewable fuel source to another.

I'd like to see breeder reactors make some headway. The amount of fissionable material on the planet is limited but.. with those, they produce more fuel than they use. Essentially we would be able to get to a point of "free" energy. I have serous doubts a/b most the "green" energy sources these days b/c of their NET ENERGY OUTPUT. i.e. how much energy did it take to make the windmill v/s it's output.