Hydrogen, unles your burning it, is an electric type of vehicle...reverse Hydrolysis.
I may have misunderstood that.
but every single engine Would not have to be replaced - they'd just be phased out...
It's just a new type of thinking. Full-Electric vehicles are in their baby-stages. I mean look at the Volt. Even it needs a gas/E85/hydrogen engine to drive practical distances.
That is the ideal setup, IMO, for the transitional stage between full gas, and full electric. We're now just waiting for batteries that can hold a 500 mile charge.
If the time arises, I will DEFINITELY be getting a Volt, Camaro first, though
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