The process begins with the biomass, like corn-derived glucose, and the conversion to gaseous isobutane results in a substance that is the building block for plastics and fuels.
The problem I see with bio-derived fuels is twofold. One, it seems to take more energy to produce the fuel overall than what the fuel delivers, and two, any mass production of biomass to make fuel takes away from our ecosystem's ability to produce biomass for food. We can't eat oil, so we may as well use it until it's gone. It is a good thing to research these alternate methods of fuel production but I don't see them as being practical anytime soon.
