abengoa algae fuel arundo associated british foods bp babassu oil bagasse bioconversion of biomass to mixed alcohol fuels biodiesel bioenergy biogas biogasoline biomass heating systems biorefinery bluefire ethanol broin butanol fuel carbon footprint cellulosic ethanol cellulosic ethanol in the united states china resources alcohol corporation chinese tallow dupont dyadic eroei energy content of biofuel energy crop energy forestry ethanol fuel fischer-tropsch process food vs fuel greenhouse gas gulf coast energy hemp industrial biotechnology iogen jatropha curcas maize mascoma miscanthus giganteus national renewable energy laboratory novozymes oak ridge national laboratory panicum virgatum pellet mill pellet stove range fuels rapeseed royal dutch shell second generation biofuels sorghum bicolor soybean stover straw sugarcane sunopta sunflower sustainable biofuel the clean tech revolution thermal depolymerization vegetable oil used as fuel verasun energy waste wood fuel xethanol