Related by context. Frequent words. (Click for all words.) 77 emissions 75 emission 70 CO2 emissions 70 greenhouse gas emissions 70 carbon dioxide emissions 69 greenhouse emissions 68 carbon emissions 67 CO2 emission 66 exhaust emissions 66 greenhouse gases 65 Emissions 65 greenhouse gasses 65 carbon emission 64 CO2 64 pollution 64 greenhouse gas emission 64 tailpipe emissions 63 GHGs 62 greenhouse gas 61 air pollution 61 GHG emissions 60 emission reduction 59 emission reductions 58 reduce carbon emissions 58 NOx 58 nitrogen oxide emissions 57 Emission 57 mercury emissions 57 carbon dioxide CO2 emissions 57 reducing carbon emissions 56 GHG 55 global warming gases 55 carbon dioxide 54 polluting 53 sulfur dioxide emissions 52 global warming 52 mercury pollution 52 carbon 51 carbon dioxide CO2 51 pollutant 51 smog 51 nitrogen oxide 51 particulate matter 50 pollutants 50 emitters 49 nitrogen oxides 49 emitting 49 carbon footprint 49 particulates 49 ozone 49 heat trapping gases 49 Pollution 49 carbon footprints 48 polluter 48 zero emission 48 polluters 48 fossil fuel 47 fossil fuels 47 exhaust fumes 47 gases 47 climate change 47 diesel 46 particulate 46 CARB 46 sulfur dioxide 46 EPA 46 diesels 45 VOCs 45 ozone pollution 45 soot 45 polluting industries 45 diesel engines 45 coal fired 45 combustion 44 diesel powered 44 burning fossil fuels 44 methane 44 Air Pollution 44 gasses 44 Clean Air 44 emit 44 pollute 44 acid rain 44 emitted 44 atmospheric carbon dioxide 43 cleaner fuels 43 Kyoto accord 43 renewables 43 carbon credits 43 Global Warming 42 Kyoto treaty 42 Kyoto protocol 42 tailpipe 42 combustion engine 42 renewable energy 42 CO 41 environmental impacts 41 C# [001] 41 g km 41 Kyoto 41 internal combustion engine