- hybrid vehicle on electricity and biodiesel/ethanol mix. Could drop fossil fuel component to less than 30%
- hydrogen vehicle. Unfortunately, hydrogen is most cheaply produced from fossil fuel. Perhaps someone can develop a better solar cell to allow for electrolysis to be more efficient. Caution with this approach is that byproducts of electrolysis of H2O include extremely caustic (pH 14+) solution that has heavy water component (i.e. radioactive duterium). I'm not a chemist, so I can't really explain the stoichiometry of it....
Coincidently, I believe it was Norway that was using electrolysis heavily in the 1940's to produce hydrogen (from water) to be used in fertilizer (ammonium nitrate). Apparantly, as the story goes, the Nazi party had begun informal experimenting with the heavy water byproduct to develop atomic energy (and possibly weapons). History could have been re-written (and not for the better) had they placed this research (and jet power) on a high priority.
