Related by context. Frequent words. (Click for all words.) 61 greenhouse gases 58 pollute 58 carbon emission 57 carbon dioxide emissions 56 carbon emissions 56 carbon credits 56 greenhouse gas 55 carbon dioxide 55 emissions 54 heat trapping gases 54 emission 53 carbon 53 greenhouse gas emissions 53 greenhouse gas emission 52 emission reductions 52 emit 51 CO2 51 emission reduction 51 polluters 50 burning fossil fuels 50 fossil fuels 50 renewable energy 50 greenhouse emissions 50 fossil fuel 50 coal fired 49 CO2 emissions 49 reduce carbon emissions 48 carbon dioxide CO2 48 renewables 48 carbon offsets 47 pollution 47 carbon capture 47 Emissions 46 GHG 46 GHG emissions 46 reducing carbon emissions 45 nitrogen oxides 45 carbon sequestration 45 polluting 45 sulfur dioxide 44 cleaner burning 44 emitters 44 Renewable energy 44 polluter 44 gases 43 mercury emissions 43 pollutant 43 biomass 42 methane 42 renewable energies 42 pollutants 42 nitrogen oxide 42 renewable 41 global warming 41 biofuels 41 Carbon dioxide 41 air pollution 41 coal 40 hydrogen 40 wind farms 40 reduce greenhouse gas 40 biofuel 40 solar thermal 40 emitting 40 climate change 39 NOx 39 electricity 39 hydroelectric 39 gasses 39 biogas 38 enrich uranium 38 energy 38 alternative fuels 38 Clean Air 38 zero emission 38 hydropower 38 Kyoto Protocol 38 bio fuels 38 peaceful purposes 38 hydroelectric dams 38 acid rain 38 electric utilities 37 Kyoto protocol 37 offshore wind 37 Renewable 37 nuclear 37 tar sands 37 geothermal 37 hydrogen fuel 37 offsets 37 Hydrogen 36 renewable fuels 36 Methane 36 liquid fuels 36 enriching uranium 36 solar 36 biodiesel 36 reducing greenhouse gas 36 windfall profits 35 Climate 35 Geothermal