Related by context. Frequent words. (Click for all words.) 91 biofuel 79 renewable fuels 77 alternative fuels 77 ethanol 74 cellulosic ethanol 73 biodiesel 69 renewable energy 67 Biofuels 67 biomass 65 fossil fuels 64 renewable 64 fossil fuel 63 bio diesel 63 renewables 63 renewable energies 62 feedstocks 60 Ethanol 57 carbon capture 56 Biodiesel 55 fuels 55 feedstock 54 Renewable 53 Biomass 53 cleaner burning 52 carbon dioxide emissions 52 greenhouse gas emissions 52 reduce carbon emissions 52 greenhouse gases 51 hydrogen 51 greenhouse emissions 51 carbon emissions 50 corn 50 environmentally sustainable 50 organic farming 50 climate change 49 hydrogen fuel 49 agriculture 49 energy 49 fuel 49 Renewable Energy 49 carbon 48 cellulose 48 greenhouse gas 48 palm oil 48 Clean Energy 48 agribusiness 48 diesel 47 CO2 47 agricultural 47 diesel fuel 47 emissions 47 soybeans 47 tar sands 47 aquaculture 47 reduce greenhouse gas 47 emission reduction 46 soybean 46 soy 46 agricultural commodities 46 carbon dioxide 46 reducing greenhouse gas 46 crop yields 46 algae 45 CO2 emissions 45 sugarcane 45 sugar cane 45 zero emission 45 nanotechnology 45 corn crop 45 global warming 45 GHG emissions 45 genetically modified 45 offshore wind 45 environmentally friendly 44 Alternative Energy 44 Hydrogen 44 petroleum 44 crops 44 sustainable 44 biogas 44 coal 44 wind farms 44 burning fossil fuels 43 hybrid electric 43 sorghum 43 organic foods 43 sustainability 43 arable land 43 environmental sustainability 43 biotechnology 43 Climate Change 43 cropland 43 hybrids 43 agri 43 fertilizers 42 Sustainable 42 organics 42 shale gas 42 gasoline 42 GMO 42 emerging economies