re: Hydrogen problems are real
Any portable energy source other then nuclear is an energy carrier. The key is the environment impact and supply of it.
As this article shows biofuel uses more petroleum then it returns in energy. Its better for the environment to just burn the gas in your tank.
http://petroleum.berkeley.edu/papers/patzek/CRPS416-Patzek-Web.pdf
They key about hydrogen is that is possible to produce where its needed. You won't be shipping it far as with other fuels. And is environment impact is a function of where you get your power from.
