There's no single answer to the fuel of the future, at least
certainly not at this time. Part of the solution lies in
reclaiming waste streams that now mostly end up in landfills.
Some of these -- like poop -- we don't even want to think about,
but it's about time we did. And scientists are on the case,
given the strange-but-true examples cited here. Cellulosic
ethanol (made from sugar cane, wood waste or sweet sorghum) is
probably the wave of the future, but here are some other ways we
can -- and probably will -- make fuel from bio-materials. Is it
possible to run a car on chocolate? Well, maybe not wholly on
chocolate. Your Hershey bar won't get you home in an emergency,
but a team from the University of Warwick in Britain has built
and is track-testing a Formula 3 race car, running on 30%
biodiesel derived from chocolate waste. That's not all; the
steering wheel is partly made of carrots, and the mirrors and
aerodynamic front wing are formed with potato starch and flax
fiber. According to James Meredith, w