Related by context. Frequent words. (Click for all words.) 61 renewable energy 60 renewable 58 fossil fuel 56 renewables 55 energy 53 fossil fuels 52 Cellulosic ethanol 52 carbon emitting 52 polluting fossil fuels 51 renewable fuels 51 Renewable fuels 50 biorefining 50 Renewable energy 49 biofuel 49 biofuels 49 renewable energies 49 biomass 49 synfuels 48 microgrids 48 alternative fuels 48 Integrated Gasification Combined Cycle 48 corn ethanol 48 alternative energies 48 biopower 48 ethanol 48 greenhouse gas 48 soy biodiesel 48 bioenergy 47 greenhouse gasses 47 environmentally benign 47 reducing greenhouse gas 47 biomass feedstock 47 greenhouse gases 47 synthetic fuels 47 windpower 46 Renewable 46 baseload electricity 46 OTEC 46 cleaner fuels 46 GHG emission 46 greenhouse gas emission reductions 46 cleaner burning 46 emission reduction 46 reducing carbon emissions 46 coal fired 45 baseload generation 45 plasma gasification 45 renewable feedstocks 45 enviro friendly 45 heat trapping carbon dioxide 45 emission 45 wind turbines solar panels 45 nonpolluting 45 CO2 emitting 45 woody biomass 45 cellulosic ethanol 45 bio fuels 45 baseload 45 carbon 45 GHG reduction 45 carbon emission 44 hydrogen 44 carbon emission reductions 44 reduce greenhouse gas 44 coal gasification 44 carbon emissions 44 environmentally friendly 44 greenhouse gas emissions 44 reduce carbon emissions 44 solar 44 greenhouse gas GHG 44 emission reductions 44 GHG 44 ecofriendly 44 biodiesel 44 greenhouse emissions 44 emissions 44 carbon dioxide emissions 43 Renewable Energy Certificates 43 coal 43 carbon sequestration 43 CO2 43 greenhouse gas emitting 43 cellulosic biofuel 43 microgrid 43 isoprene 43 Wellinghoff 43 bioeconomy 43 nonrenewable resources 43 cleaner greener 43 Algenol 43 emit greenhouse gases 43 cellulosic feedstocks 42 Renewable Choice 42 biogenic 42 hydroelectricity 42 cellulosic 42 modular scalable 42 geothermal 42 biobased 42 nuclear