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Related by context. Frequent words. (Click for all words.) 64 alternative fuels 58 renewable fuels 58 biodiesel 56 diesel 56 biofuel 53 diesel engines 53 ethanol 53 biofuels 52 flex fuel 52 bio diesel 52 diesel fuel 52 fossil fuels 51 environmentally friendly 51 compressed natural 51 diesel powered 50 renewable 50 renewable energy 50 cleaner 49 emission reduction 49 coal fired 49 nitrogen oxides 48 gasoline 48 reduce greenhouse gas 48 Biodiesel 48 bio fuels 48 cellulosic ethanol 48 fossil fuel 48 coal 47 refiners 47 emissions 46 biomass 46 Clean Air 46 air pollution 45 natural gas 45 zero emission 45 greenhouse gas 45 diesels 45 reduce carbon emissions 45 polluting 45 diesel engine 45 sulfur 45 greener 44 fuel 44 greenhouse gases 44 retrofitting 44 hydrogen fuel 44 emission 44 carbon dioxide emissions 44 fuels 44 feedstocks 44 hydrogen 44 hybrid electric 44 renewables 43 hydrogen powered 43 emission reductions 43 internal combustion engine 43 greenhouse gas emissions 43 bioethanol 43 Hydrogen 43 gasification 43 retrofit 43 switchgrass 42 Renewable 42 Ethanol 42 hybrids 42 renewable energies 42 carbon capture 42 sulfur dioxide 42 Clean Energy 42 CNG 41 retrofits 41 jatropha 41 combustion 41 bioenergy 41 cogeneration 41 environmentally sound 41 wood chips 41 hybrid 40 feedstock 40 reducing carbon emissions 40 boilers 40 smog 40 carbon dioxide 40 incandescent bulbs 40 unleaded gasoline 40 refineries 40 catalytic converters 40 Environmental Protection Agency 40 electric hybrid 40 dirtier 40 reducing greenhouse gas 39 pollutants 39 heating oil 39 Biofuels 39 carbon emission 39 Biomass 39 particulate matter 39 burning fossil fuels 39 soot 39 efficient 39 greenhouse emissions

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