Related by context. Frequent words. (Click for all words.) 56 alternative fuels 55 Mascoma Corporation 55 bio fuels 53 biodiesels 53 Renewable fuels 53 biorefining 52 alternative energies 51 hydro geothermal 51 biofuels 51 Daniel Sperling 51 algal biofuels 51 Xethanol Corporation 50 renewable fuels 50 nonpetroleum 50 lignocellulosic biomass 49 Christopher Flavin 49 cellulosic feedstock 49 Terrabon 49 Coal gasification 49 algae biofuels 48 hydro biomass 48 biofuel 48 Cellulosic ethanol 48 sugarcane bagasse 48 cellulosic feedstocks 48 CALSTART 48 bioelectricity 47 GCEP 47 refining petrochemicals 47 DuPont Danisco Cellulosic Ethanol 47 bioenergy 47 propane autogas 47 Cellulosic Ethanol 47 Virent Energy 46 biofuel feedstock 46 Howard Learner 46 algae biofuel 46 smallholder agriculture 46 cellulose ethanol 46 algae biomass 46 gaseous fuels 46 CO2 emission reduction 46 renewable energy 46 biomass geothermal 45 fossil fuels 45 liquefied coal 45 Masdar Abu Dhabi 45 FreedomCAR 45 GlycosBio 45 Segetis 45 biomass feedstock 45 Solix Biofuels 45 cellulosic biofuels 45 Biofuel 45 Virent 45 decarbonization 45 cleaner fuels 45 Shell Hydrogen 45 ethanol methanol 45 biomass feedstocks 45 Cilion 45 Fatih Birol chief 45 BlueFire Ethanol Fuels 45 Cellulosic 44 Biobutanol 44 Amyris Biotechnologies 44 jatropha plantations 44 Bioethanol 44 biomass hydro 44 energy 44 manure digesters 44 fossil fuel 44 Elevance 44 renewable 44 Institute WRI 44 coproducts 44 cellulosic materials 44 refining petrochemical 44 polluting fossil fuels 44 Mazria 44 ethanol 44 IGCC plants 44 biocrude 44 bio diesel 44 corn ethanol 44 Rentech Process 44 CO2 sequestration 44 ethanol distilleries 44 biomass 44 sugar cane ethanol 44 Reduce Emissions 44 windmills solar panels 44 Hythane 44 Myriant 44 includes eLabs 44 Abu Dhabi Masdar 44 Accelergy 44 CNG compressed natural 44 EPA SmartWay Transport 43 agricultural residues 43 renewable energies