I have been waiting for hydrogen powered automobiles for forty years. Hydrogen will be the solution to the range anxiety that haunts battery powered vehicles. We will be able to eliminate carbon from the fuel cycle.
Only about thirty for me. I remember a NOVA show about this, "The Invisible Flame", from the early 80s. IIRC there was a town somewhere out west (Colorado?) where the vehicles had been adapted to run on either hydrogen or gasoline. The switch back and forth was accomplished by only throwing a couple of valves under the hood. Never heard the outcome of that experiment..
Why would you want to do that?
Sure, and the inventors of the Hindenburg thought hydrogen would revolutionize air travel.