Related by context. Frequent words. (Click for all words.) 41 gasification 40 bio diesel 40 cellulosic 39 biodiesel 39 liquid fuels 38 solar cells 38 biomass 38 bioplastics 37 photovoltaic 36 feedstock 36 bio fuels 36 hydrogen 35 coal gasification 35 cellulosic ethanol 35 feedstocks 35 renewable 35 biofuel 35 photovoltaics 34 syngas 34 carbon capture 33 bioethanol 33 anaerobic digestion 33 polymers 33 Biomass 33 synthetic fuels 33 methanol 33 biofuels 32 renewable energy 32 Renewable 32 bioenergy 32 Hydrogen 32 cleaner burning 31 biogas 31 cellulose 31 carbon sequestration 31 renewable fuels 31 wood chips 30 cleaner fuels 30 Sasol 30 alternative fuels 30 cogeneration 30 diesel fuel 30 low sulfur diesel 30 hydrogen fuel 30 hybrid electric 30 alternative energies 29 wood pellets 29 combustion 29 diesel 29 hydrogen powered 29 renewable energies 29 petroleum 28 bitumen 28 Biofuel 28 ethanol 27 Biodiesel 27 hydrocarbon 27 refrigerants 27 fuel 27 internal combustion engines 26 Methanol 26 boilers 26 Biofuels 26 renewables 26 liquefied gas 25 fuels 25 energy 25 diesel engines 25 vegetable oils 24 jatropha 24 switchgrass 24 internal combustion engine 24 methane 24 fossil fuels 24 hydrocarbons 23 petrochemicals 23 cooking oils 23 compressed natural 23 lignite 23 natural gas 22 PetroSA 22 coal 22 soda ash 22 flex fuel 22 fossil fuel 22 LNG 22 baseload 22 oil 22 crude oil 21 naphtha 21 liquefied natural gas 21 Liquefied Natural Gas 20 Btu 20 gas 19 gasoline 18 Renewable energy 17 thermal coal 16 electricity 14 heating oil 10 Natural gas 9 burning fossil fuels