Related by context. Frequent words. (Click for all words.) 60 regulate heat trapping 57 Clear Skies Initiative 57 regulate greenhouse gases 55 EPA 54 sulfur dioxide nitrogen oxide 53 Environmental Protection Agency 53 regulate greenhouse gas 52 regulate carbon dioxide 51 promulgate regulations 51 sulfur dioxide nitrogen oxides 51 regulate tailpipe emissions 51 mercury emitted 51 FFDCA 51 smokestack emissions 50 BACT 50 Clear Skies initiative 50 greenhouse gases GHGs 50 regulating greenhouse gases 50 Waxman Markey cap 50 pollutant 49 remove gray wolves 49 tailpipe emission 49 regulating greenhouse gas 49 Economy CAFE standards 49 Tailoring Rule 48 WVDEP 48 tailpipe standards 48 USEPA 48 biotech alfalfa 47 nonattainment areas 47 pollute waterways 47 smog forming nitrogen oxides 47 Clean Smokestacks Act 47 Electric Reliability Coordinating 47 Clean Air 47 Sebelius vetoed 47 TSCA 46 mercury pollution 46 COICA 46 NAAQS 46 tailpipe emission standards 46 HJ Res 46 nitrogen oxide NOx emissions 46 Clean Water Restoration 46 Waxman Markey 46 Clear Skies 46 spokesman Dale Kemery 46 mercury emissions 46 Rulemaking 46 OIRA 46 pollution 46 SCAQMD 46 Chairwoman Barbara Boxer 46 endangered species protections 46 Coal gasification 46 Waxman Markey bill 46 Act CEQA 45 pollution abatement 45 greenhouse gases endanger 45 delist wolves 45 Framework Directive 45 Clean Water Act 45 polluters 45 tailpipe pollution 45 Surface Mining Control 45 sulfur dioxide SO2 45 Internal quotation marks 45 GHGs 45 dischargers 45 polluting waterways 45 Waste Framework Directive 45 legislates 45 Low Level Radioactive 45 greenhouse gases GHG 44 Endangered Species Act 44 REACH Registration 44 FCC overstepped 44 legislate 44 EPBC Act 44 intermittent streams 44 Kyoto Protocols 44 enact stricter 44 PURPA 44 constitutionally questionable 44 PL #-# [002] 44 SO2 emissions 44 emitting greenhouse gases 44 GHG emission 44 heat trapping gases emitted 44 overly prescriptive 44 Pollution Control Agency 44 groundwater withdrawals 44 unelected bureaucrats 44 Rodenticide Act 44 Clean Neighbourhoods 44 interstate commerce clause 44 Waxman Markey climate 44 Emissions Trading Scheme ETS 44 FIFRA 43 reregulate 43 emit CO2