Related by context. Frequent words. (Click for all words.) 55 tailpipe emissions 52 heat trapping gases 52 greenhouse gases 49 EPA 49 mercury emissions 48 greenhouse gas 48 greenhouse gas emissions 48 pollutant 48 emissions 47 rulemaking 46 greenhouse gasses 46 carbon dioxide emissions 46 reduce greenhouse gas 46 global warming gases 46 Endangered Species Act 45 emission reduction 45 greenhouse gas emission 45 Clean Air 44 gases blamed 44 mercury pollution 44 emission reductions 44 pollutants 44 GHG emissions 43 reduce carbon emissions 43 greenhouse emissions 42 carbon dioxide 42 emission 41 GHG 41 Environmental Protection Agency 41 Emissions 41 global warming 41 carbon emissions 41 nitrogen oxide 41 reducing greenhouse gas 40 nitrogen oxides 40 burning fossil fuels 40 reducing carbon emissions 40 renewable fuels 40 RGGI 40 Dingell 40 regulate 39 alternative fuels 39 tailpipe 39 CARB 39 fossil fuels 38 air pollution 38 climate change 38 coal fired 38 polluters 38 Environmentalists 38 filibusters 38 Kyoto Protocol 38 cleaner burning 38 pollution 37 Newdow 37 filibuster 37 legalizing gay marriage 37 Military Commissions Act 37 overturn 37 Commerce Clause 37 MTBE 37 eminent domain 36 legislatively 36 CO2 emissions 36 Kyoto treaty 36 scrappage 36 phthalates 36 cleaner fuels 36 defund 36 scrappage scheme 36 hydrogen fuel 36 net neutrality 36 roadless areas 36 DOMA 36 tailpipes 36 polluter 36 renewables 36 warrantless surveillance 36 gas guzzling 36 recess appointment 36 reauthorize 36 environmentalists 36 EU ETS 36 item veto 36 legislate 36 judicial nominations 36 carbon emission 36 diesel powered 36 gas guzzlers 35 AB# [001] 35 Kyoto accord 35 hybrid electric 35 smokestacks 35 polluting 35 EPA Administrator 35 Clunkers 35 secrets privilege 35 SCHIP 35 Genachowski 35 regulating 35 Automakers