How before Mr. Oil-Man Bush puts his paws on this!
Personnaly I thinks hybrid and plug in hybrid have a greater future ahead. I don't really understand how this work, and even this work well there is a law that say in chemestry that you can't create energy, so that mean that maybe yes the car will be emission free, but the pollution is only move away to the place which has to produce the energy initialy required (same things, with electric car and hydrogen car). The adventage of oil is that we don't create it and only do some sligth transformation on it, so it give back more energy than we use to transform it.
aLuminum requiers lot of energy to refine, thats why bauxite from the Carribiean is shipped to plants near hydro-dams in BC and Iceland. Not what I would consider a practical fuel. I saw a system for combining hydrogen and Borax soap to fuel cars.
Flintstone cars are the most fuel efficient.