Actually, this method makes pretty much
all petroleum products "bio-fuel" since it's made from waste biomass (cornstalks, sewage, medical refuse, etc.). And since it's essentially recycling carbon that's
already part of the biosphere, as opposed to sucking extra carbon out of the ground and introducing it into the biosphere, the greenies out to be jumping up and down with glee. Strange that something which should get both the Ralph Nader and Big Bil happy is getting so completely ignored, isn't it?