Related by context. Frequent words. (Click for all words.) 42 Cellulosic ethanol 42 cellulosic biomass 41 cellulosic 38 biofuels 38 environmentally benign 37 biofuel 37 biobutanol 37 cellulose 36 bio diesel 36 butanol 36 commercially viable 36 biodiesel 35 PEM fuel 35 hydrogen 35 bioplastic 34 commercially feasible 34 cellulosic ethanol 34 renewable 34 environmentally harmful 34 cellulosic biofuels 33 jatropha 33 Jatropha 33 uneconomical 32 thorium 32 sufficient quantities 31 alternative energies 31 economically viable 31 nonpolluting 30 environmentally friendly 30 technically feasible 30 commercially 30 extractable 30 biorefinery 29 hydrogen fuel 29 economically feasible 29 technologically feasible 29 manufacturable 28 carbon capture 28 biodegradable 28 economically unfeasible 27 economically unviable 27 sustainable 27 environmentally sound 27 useable 26 feasibility studies 26 uneconomic 26 viable 26 environmentally sustainable 26 feasible 26 economical 26 hydrogen powered 25 graphene 25 semiconducting 25 usable 25 greenfield 25 spintronics 25 implementable 24 zero emission 24 feasibility study 23 unexploited 23 experimental 23 carbon neutral 23 commercializing 22 realizable 22 pluripotent 22 prototype 22 commercialization 22 successfully commercialize 21 suitable 21 marketable 21 salable 21 recoverable 21 self sustaining 21 commercialize 21 monetising 21 prototypes 21 financially viable 20 successfully commercialized 20 sufficient 20 financially feasible 20 tenable 20 unviable 19 achievable 19 workable 19 bankable 19 infeasible 19 greenfields 18 patentable 18 unfeasible 18 commerciality 18 operate profitably 17 commercialized 17 profitable 17 profitably 16 scientific breakthroughs 15 prohibitively expensive 15 viability 15 prohibitive 14 unprofitable 11 venture 11 worthwhile