Related by context. Frequent words. (Click for all words.) 67 coal gasification 66 Gasification 64 Integrated Gasification Combined Cycle 62 Cellulosic ethanol 61 coal liquefaction 60 geosequestration 60 CO2 sequestration 58 plasma gasification 58 Switchgrass 58 biomass 58 artificial photosynthesis 57 gasification 57 biorefining 57 carbon sequestration 57 renewable feedstocks 57 integrated gasification 57 combined cycle IGCC 57 biomass gasification 56 cellulosic materials 56 cellulose ethanol 56 environmentally benign 56 supercritical 55 gasify 55 gasified 55 carbon dioxide sequestration 55 IGCC 55 thermoelectric materials 55 pulverized coal 54 biomass feedstocks 54 IGCC plant 54 Renewable fuels 54 circulating fluidized bed 54 biomass feedstock 54 Fischer Tropsch 53 geothermal 53 electrolyzer 53 coal 53 lignite coal 53 anaerobic digesters 53 underground coal gasification 53 nonpolluting 53 cellulosic biomass 53 Renewable energy 53 Concentrating Solar Power 53 renewable energy 53 OTEC 53 carbon capture 52 syngas 52 woody biomass 52 Biochar 52 methane digester 52 Biogas 52 renewable 52 Hydraulic fracturing 52 fossil fuel 51 cellulosic 51 methane digesters 51 biogas 51 switchgrass 51 biofuel feedstock 51 pyrolysis 51 SX EW 51 thorium 51 coal gasification plant 51 biopower 51 biochar 51 cellulosic feedstocks 51 fossil fuels 51 rice husk 51 Mountaintop removal 51 cellulosic ethanol 51 Novomer 51 converts sunlight 51 SOFCs 51 N Viro Fuel 50 Geothermal 50 geo thermal 50 flue gases 50 bioleaching 50 Bioethanol 50 cleaner burning 50 Sequestration 50 agricultural residues 50 Biomass 50 liquid fuels 50 Longannet 50 biofuel 50 proton exchange 50 biomass boilers 50 feedstock 49 rice husks 49 alternative fuels 49 liquefied coal 49 biocatalysts 49 biobutanol 49 bioenergy 49 coal fired 49 conventional internal combustion 49 EfW 49 synthetic fuels 49 kerogen