dave,
The energy technology dreams of the future all rest on "deus ex machina" of fusion reactors, sinced everything else we have tried really doesn't work very well. Actually, nucular fission does work well, but technologists get an F in public relations, so we are in the situation we are in as a result.
Once we get good cheap energy from fusion, it will be the source, and electric distribution will dominate the land side. I think liquid hydrogen gas will serve as the fuel source for transport devices in air and space, since the weight energy density is so good. Fuel cells might get very good, too, but all they would do is re-combine the hydrogen and oxygen that we had split earlier.
Regarding Nichole, she sent me this yesterday:
