But Jon wasn't claiming we'd see Mr Fusion from Back to the Future. He was saying we could use fusion power stations to produce hydrogen as a fuel source for hydrogen-combustion or fuel-cell vehicles.
Maybe that's what he meant but I was asking specifically about using fusion "in" a car (Message 11). I think we're all on the same page about that now.
Re: reality of fusion vs solar, wind and other renewable sources
Jon writes:
Grid power is here to stay.
That prediction is about as useful as "fusion is the only answer".
It's possible that our civilization will evolve a small-scale distributed system using solar, wind, etc. It's also possible that our civilization will collapse because of its dependence on big energy.