Biofuels would be an excellent alternative to conventional gasoline
and diesel if it weren’t for one nagging problem: they are
energy-intensive to produce. Bio-ethanol
was once seen as the holy grail of alternative fuels, but a poor energy
balance and competition with food supply made it more of a lame duck
than any sort of exalted enviro-savior. New Mexico-based Sundrop Fuels, however, has developed a hybrid solar-biomass refinery to address...



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