Related by context. Frequent words. (Click for all words.) 64 greenhouse gases 60 carbon emissions 60 greenhouse gasses 59 greenhouse gas emissions 58 carbon dioxide emissions 57 emissions 57 fossil fuels 56 burning fossil fuels 56 heat trapping gases 56 carbon dioxide 56 greenhouse gas 55 greenhouse emissions 55 polluting 55 polluters 54 GHGs 54 carbon emission 54 CO2 emissions 54 fossil fuel 54 emission reductions 54 CO2 53 carbon 53 greenhouse gas emission 53 reduce carbon emissions 52 polluter 50 carbon dioxide CO2 50 GHG emissions 50 emission 50 reducing carbon emissions 49 pollution 49 pollute 48 carbon dioxide CO2 emissions 48 emitters 48 GHG 48 global warming gases 48 tailpipe emissions 47 global warming 47 CO2 emission 47 carbon credits 47 Emissions 46 emission reduction 46 polluting industries 46 combating global warming 46 climate change 45 atmospheric carbon dioxide 45 carbon sequestration 45 reducing CO2 emissions 44 sulfur dioxide emissions 44 Carbon dioxide 43 reduce greenhouse gas 43 mercury emissions 43 air pollution 43 methane 43 coal fired 43 carbon footprints 43 deforestation 43 sulfur dioxide 42 coal 42 pollutant 42 pollutants 42 mercury pollution 42 reducing greenhouse gas 42 renewable energy 41 environmentally damaging 41 carbon footprint 41 cleaner fuels 41 externalities 41 RGGI 41 emitting 41 carbon offsets 41 renewables 41 Industrial Revolution 41 climate 40 exhaust emissions 40 regulate carbon dioxide 40 regulate greenhouse gases 40 Waxman Markey 40 gases 40 Global warming 40 Kyoto accord 40 industrialized 40 carbon capture 39 acid rain 39 internal combustion engine 39 emit 39 cleaner burning 39 gases blamed 39 electricity 39 ecological footprint 38 emission allowances 38 CFCs 38 carbon neutral 38 biofuels 38 zero emission 38 bankrupting 38 liquid fuels 38 Kyoto Protocol 38 Renewable energy 38 Kyoto protocol 38 installing solar panels 37 environmentally sound 37 subsidizing