Related by context. Frequent words. (Click for all words.) 77 CO2 emissions 70 CO2 emission 70 carbon emissions 69 carbon dioxide emissions 68 C# emissions 66 emissions 65 carbon dioxide emission 65 greenhouse gas emissions 65 CO2 64 carbon dioxide CO2 emissions 64 carbon emission 63 greenhouse emissions 62 greenhouse gasses 60 greenhouse gases 60 greenhouse gas GHG emissions 59 exhaust emissions 59 GHGs 59 reducing carbon emissions 59 GHG emissions 58 reduce carbon emissions 58 emission 58 reducing CO2 emissions 57 greenhouse gas emission 56 carbon 56 Emissions 56 particulate emissions 55 emission reductions 55 NOx emissions 55 greenhouse gases emitted 54 carbon dioxide emitted 54 carbon dioxide 54 greenhouse gas 53 tailpipe emissions 53 carbon emitting 52 emission reduction 52 carbon footprint 51 carbon dioxide CO2 51 ecological footprint 50 pollution 50 carbon footprints 50 atmospheric CO2 49 Greenhouse gases 49 global warming gases 49 NOx 48 air pollution 48 GHG 48 Carbon Dioxide 48 CAFE standards 47 nitrogen oxide emissions 47 carbon offsetting 47 burning fossil fuels 46 #ppm [001] 46 fossil fuel 46 heat trapping gases 46 efficiency 46 mercury emissions 45 atmospheric carbon dioxide 45 mercury pollution 45 g km 45 global warming 45 climate change 44 Carbon Footprint 44 particulate pollution 44 C# [001] 44 nitrogen oxides 44 sulfur dioxide emissions 44 fossil fuels 44 polluting 44 Greenhouse Gas 44 pollutants 43 #g/km [002] 43 SO2 43 Low Carbon 43 Emission 43 recyclability 42 environmentally damaging 42 nitrogen oxide 42 environmental friendliness 42 Environment Commissioner Stavros 42 greenhouse gas emitters 42 renewables 41 combustion engine 41 environmental impacts 41 biofuels 41 pollutant 41 nitrogen dioxide 41 Waxman Markey 41 zero emission 41 carbon neutrality 41 carbon neutral 40 Emissions Trading Scheme 40 particulate matter 40 bioethanol 40 biodiversity 40 eco friendliness 40 consumption 40 emit greenhouse gases 40 exhaust gases 40 deforestation 40 anthropogenic 40 heat trapping greenhouse gases