sandy mclean - while I'd be all in favour of hydrogen economy and vehicles that run on fuel cell but - (Steven Chu the national science advisor in a recent technologyreview article -points out the problems
currently you get hydrogen from reforming methane (which loses valuable energy and still releases c02) second there is no reliable and inexpensive storage mechanism, third the fuel cells are not there yet, and you need a distribution infrastructure. That's 4 major developments that have to happen to make it viable.

and thanks for your points JohninKansas,
the carbon fibre vehicle I mention is Amory Lovins (Rocky Mountain Inst) concept car, designed to reduce vehicle weight much more existing cars. Although it doesnt seem to interest the auto industry much.

Keith - Im not entirely sure we cant replace electricity from fossil fuels. There was an MIT geothermal heat mining study that proposed a more ambitious method of getting geothermal energy and not just in the western US. Granted it means drilling much deeper say 2-3 kilometrers but oil drilling technology can go even deeper.
It has to be cheaper than a nuclear plant.