Related by context. Frequent words. (Click for all words.) 90 greenhouse gas emissions 87 carbon emissions 87 emission 87 carbon dioxide emissions 86 greenhouse emissions 83 greenhouse gases 82 CO2 emissions 82 carbon emission 82 GHG emissions 81 emission reductions 80 greenhouse gas 80 Emissions 78 emission reduction 72 CO2 71 GHG 71 reduce carbon emissions 70 pollution 69 mercury emissions 68 reducing carbon emissions 68 carbon 68 carbon dioxide 67 air pollution 65 heat trapping gases 62 nitrogen oxides 61 pollutants 60 emitters 59 polluters 58 pollutant 57 particulate matter 56 carbon footprint 56 polluter 56 sulfur dioxide 55 Kyoto Protocol 54 carbon footprints 54 global warming 54 polluting 54 Clean Air 54 climate change 53 carbon credits 53 EPA 52 Kyoto 52 soot 52 fossil fuels 52 particulates 52 coal fired 52 renewables 51 fossil fuel 51 Kyoto protocol 51 zero emission 51 carbon offsets 50 burning fossil fuels 50 smog 50 carbon capture 49 gases 49 emitting 49 ozone 49 ETS 48 reduce greenhouse gas 48 emit 48 renewable energy 48 acid rain 47 biofuels 47 Environmental Protection Agency 47 cleaner burning 47 Climate Action 47 biofuel 46 carbon sequestration 46 volatile organic compounds 46 diesel engines 46 pollute 46 reducing greenhouse gas 46 Pollution 46 diesel 46 methane 46 emitted 46 Climate Change 46 Air Quality 46 carbon neutral 45 environmental impacts 44 alternative fuels 44 diesels 44 environmental 43 renewable 43 combustion 43 renewable fuels 43 mpg 43 Carbon 43 diesel powered 43 smokestacks 43 emitter 42 CDM 42 environmentally friendly 42 coal 42 biomass 41 Climate 41 EVs 41 deforestation 41 toxic chemicals 41 internal combustion engine 41 climate 41 mercury