[rellimpank]

--an "efficient" hydrogen fueled vehicle depends on a cheap source of energy to obtain and store hydrogen in a form not chemically bonded to something else, most commonly oxygen.

It must obey not only the laws of physics, but of equal importance , make economic sense---

[Nate1984]

It's called electrolysis, and is relatively basic, it just requires an electrical current. As we know, electricity can come from a number of sources already. And it's more like the laws of chemistry.