Related by context. Frequent words. (Click for all words.) 59 finite 53 fossil fuels 48 scarce 47 aquifers 46 consumptive 44 fossil fuel 44 Conserving 44 inelastic 43 scarcity 42 conserving 42 resources 42 desalinated water 42 aquifer 41 shale deposits 41 bio fuels 40 alternative energies 40 unsustainable 40 potable 40 scarcer 40 alternative fuels 40 groundwater 40 vast quantities 40 arable land 39 tar sands 39 outstrip supply 39 ANWR 39 pollutes 39 desalination 39 freshwater 39 depletion 39 conserve 39 renewable 39 resource 38 abundant 38 commodity 38 liquid fuels 38 depleting 38 precious 38 carbon sequestration 38 desalination plants 38 renewables 37 economically viable 37 mineral extraction 37 vast amounts 37 biofuels 37 sustainably 37 carbon sinks 37 fungible 37 environmentally sensitive 37 inexhaustible 37 pollute 36 rapid industrialization 36 corn ethanol 36 IPv4 addresses 36 conserves 36 shale 36 thorium 36 rationed 36 ecosystems 36 economically feasible 36 outstrips supply 36 burning fossil fuels 36 guzzlers 35 atmospheric carbon dioxide 35 consume 35 outstripping supply 35 irrigate 35 biofuel crops 35 IPv4 35 developable land 35 water 35 reservoirs 35 feedstock 35 Groundwater 35 chemical fertilizers 35 zero sum 35 atmospheric CO2 35 minerals 35 birthright 35 supply 35 evaporates 35 conservation 35 conserved 34 cleaner fuels 34 biomass 34 rationing 34 lifeblood 34 feedstocks 34 coalbed methane 34 evaporation 34 ecologically 34 biofuel 34 overgrazing 34 irrigators 34 renewable energy 34 hydrogen 34 drinkable water 34 headwaters 34 Renewable energy 34 environmentally damaging 34 plentiful