I plan on buying a diesel, when I eventually get around to buying a car, so I can run on biodiesel-- to be used for long trips only.** My part against global warming. That said, if *everybody* were to transition to biofuels, it would be an unmitigated disaster for other species, as every square inch of land would be appropriated to feed and fuel an expanding human population.
And then there's the problematic morality of allowing human starvation in a world where people are powering their SUVs on corn....
** I've heard, however, that the new battery technology allows for 6 minute "dump recharges" and 250 mile ranges, which, if true, makes electric vehicles feasible alternatives to carbon-fueled vehicles.