Related by context. Frequent words. (Click for all words.) 53 economically recoverable 48 Peak Oil 48 fossil fuel 48 Fossil Fuels 47 operating netback 47 tar sands 47 extractable 47 renewable feedstocks 47 biofuel feedstock 47 Cellulosic ethanol 47 unlevered 47 fossil fuels 46 corn ethanol 45 crop residues 45 Switchgrass 45 producible 44 IRRs 44 finite resource 44 mean reversion 43 Proved reserves 43 operating netbacks 43 mb d 43 calorific value 43 renewables 43 albedo 43 Fossil fuels 43 atmospheric CO2 43 carbon sequestration 43 biomass 43 CAPM 43 ROIs 43 PE ratios 42 isoprene 42 gigatonnes 42 Proved plus 42 stover 42 payout ratios 42 biogenic 42 hydrocarbon fuels 42 Tcf 42 Alberta tar sands 42 GHG emission 42 nat gas 41 BTUs 41 alternative energies 41 feedstock 41 CO2 concentrations 41 feedstocks 41 BCFE 41 netbacks 41 thousand cubic feet 41 Geoengineering 41 distiller grains 41 Miscanthus 41 storable 41 MMBO 41 logarithmic 40 Fossil Fuel 40 biofuels 40 oil sands 40 realizable value 40 Greenhouse Gases 40 EOR 40 ANWR 40 RoE 40 btu 40 ROCE 40 conventionally 40 Co2 40 nitrogen fixation 40 abiotic 40 synfuels 40 depletion depreciation 40 Biochar 40 corn stover 40 #GW [002] 40 Internal Rate 40 netback 40 renewable 40 cellulosic ethanol 40 anthropogenic climate 40 mcf 39 anthropogenic global warming 39 Btu 39 GHGs 39 Greenhouse Gas Emissions 39 CO2 39 Proved Reserves 39 Thorium 39 thorium 39 conventional 39 hydrocarbon 39 ROI 39 greenhouse gas emission reductions 39 nominal GDP 39 woody biomass 39 valuation metrics 39 unleveraged 39 British Thermal Units 39 metallurgical recoveries 39 Sequestration