Related by context. Frequent words. (Click for all words.) 57 greenhouse gases 56 heat trapping gases 52 greenhouse gasses 52 greenhouse gas emissions 50 greenhouse gas 49 carbon emissions 49 carbon dioxide emissions 49 regulate greenhouse gases 49 greenhouse emissions 48 global warming gases 48 emissions 47 mercury emissions 46 mercury pollution 45 gases blamed 44 reducing carbon emissions 44 carbon dioxide 43 tailpipe emissions 43 reduce carbon emissions 43 fossil fuels 43 burning fossil fuels 42 greenhouse gas emission 41 GHG emissions 41 carbon emission 40 polluters 40 global warming 40 nitrogen oxides 40 GHG 40 Baucus 40 CO2 emissions 40 nitrogen oxide 40 Bingaman 40 pollutants 39 emission reduction 39 pollution 39 Emissions 39 renewable fuels 39 carbon 39 HFCs 38 emitters 38 air pollution 38 emission 38 sulfur dioxide emissions 38 CO2 38 Strategic Arms Reduction Treaty 37 Kyoto accord 37 fossil fuel 37 pollutant 37 atmospheric carbon dioxide 37 reduce greenhouse gas 37 climate change 37 emission reductions 36 carbon dioxide CO2 36 polluter 36 cleaner burning 36 sulfur dioxide 36 Dingell 35 Browner 35 reducing greenhouse gas 35 renewable energy 35 sweeping overhaul 35 EPA 35 alternative fuels 35 ozone pollution 35 Kyoto treaty 35 Inhofe 35 Carbon dioxide 35 polluting industries 34 EPA Administrator 34 Environmental Protection Agency 34 renewables 34 MTBE 34 emitter 34 Kyoto Protocol 34 emit 34 Barrasso 34 RGGI 34 electric utilities 33 Reid D-Nev. 33 legislation 33 filibuster 33 Sen. Ken Salazar 33 NOx 33 nuclear arsenals 32 gases 32 Kyoto protocol 32 pollute 32 exhaust emissions 32 ANWR 32 appropriations bills 32 acid rain 32 polluting 32 Clean Air 32 methane 32 Fratto 32 environmentalists 32 President Barack Obama 32 START treaty 32 omnibus spending 32 Fred Upton 32 smokestacks 32 Majority Leader Harry Reid