Related by context. Frequent words. (Click for all words.) 42 Coal gasification 42 costeffective 42 prohibitively expensive 41 environmentally beneficial 40 breeder reactors 39 expensive 39 readily adaptable 38 environmentally benign 38 lowcost 38 cheaper 38 technically feasible 38 economically unviable 37 costly 37 economically advantageous 37 photonic devices 37 destroys embryos 37 feasible 37 prohibitively costly 36 inexpensive 36 logistically challenging 36 uneconomical 36 bioenergy crops 36 horrendously expensive 36 economical 36 International Linear Collider 36 comparatively inexpensive 36 logistically impossible 35 exorbitantly expensive 35 relatively inexpensive 35 desalinization plants 35 prohibitive 35 Reverse osmosis 35 gasify 35 commercially viable 35 alternative 35 involves inserting 35 environmentally unsound 34 preferable 34 commercially feasible 34 biomass feedstock 34 commercially 34 bypasses 34 infeasible 34 logistically 34 gasification 34 economically feasible 34 biowaste 34 artificial photosynthesis 34 economically 33 labor intensive 33 less expensively 33 astronomically expensive 33 Rainwater harvesting 33 environmentally 33 sequestration CCS 33 industrially 33 financially unfeasible 33 environmentally damaging 33 unviable 33 alterative 33 CO2 sequestration 33 unpractical 33 viable 33 esophagectomy 33 fundable 33 prohibitively 33 thermographic 33 obviates 32 chemically identical 32 unadvisable 32 BEVs 32 thermally stable 32 biodegradeable 32 economically viable 32 algae biofuels 32 uncongested 32 equivalently 32 implantations 32 theoretically 32 technically 32 scramjets 32 inhospitable environments 32 OTEC 32 desalinization 32 geographically isolated 32 impractical 32 ruinously expensive 32 invasive 32 inefficient 32 randomly assign 32 algae biomass 32 desalinate 32 diagnostically 32 accesible 32 gas liquefaction 32 transportable 32 large scale 32 Virtual colonoscopy 32 renewable feedstocks 32 geographically dispersed locations 32 cellulosic biomass