[Myrddin]

Hydrogen is a STORE of energy. It must be generated from a SOURCE of energy. Typically electrolysis of water or scavenged from natural gas. It is inefficient to produce and transport. The only reason to bother with hydrogen is where the combustion products should not be toxic e.g. in a space craft. It makes no sense for a car or airplane.

[Strk321]

Hydrogen is a powerful, but extremely inefficient fuel. Not only does it have to be cooled to _very_ low temperatures (colder than oxygen) to become a liquid, but its low molecular density requires large storage tanks.

As an example of the technical difficulties involved, the American space program was using LH-fueled rockets in the ‘60s, but the less advanced Soviet program didn’t attempt it until the ‘80s.

One would think too that the extreme flammability of hydrogen would make it a tad dangerous for use outside of rockets. Hindenburg disaster, anyone?