Related by context. Frequent words. (Click for all words.) 60 greenhouse emissions 57 greenhouse gas emissions 57 GHG emission 56 C# emissions 55 carbon dioxide emission 55 carbon dioxide emissions 54 greenhouse gases 54 carbon emissions 54 greenhouse gasses 53 greenhouse gas emission 53 reduce carbon emissions 53 emissions 52 CO2 emissions 52 greenhouse gas 51 reducing carbon emissions 51 carbon emission 51 VOC emissions 51 GHGs 51 greenhouses gases 50 nitrous oxides 50 GHG emissions 50 CO2 50 greenhouse gas GHG emissions 49 megatonnes 49 greenhouse gas emission reductions 49 pollutant emissions 49 Carbon dioxide emissions 48 GHG reduction 48 Co2 48 CO2 emission 48 carbon emission reductions 48 carbon dioxide CO2 emissions 48 tailpipe emissions 48 emission 47 reduce greenhouse gas 47 greenhouse gas GHG 47 warming gases 46 Emissions 46 nitrous oxide emissions 45 carbon emitter 45 exhaust emissions 45 emission reduction 45 emission reductions 45 pollution 45 greenhouse gas emitter 45 sulfur dioxide SO2 45 carbon dioxide 45 smog forming emissions 45 greenhouse gas emitting 45 reducing CO2 emissions 45 curbing greenhouse gases 45 greenhouse gases emitted 44 Waxman Markey bill 44 nitrogen oxide emissions 44 CAFE standards 44 Greenhouse Gas 44 global warming gases 44 carbon dioxide CO2 44 GHG 44 particulate matter emissions 44 global warming 44 fossil fuel 44 carbon emitted 43 Greenhouse Gas Emissions 43 CO2 emitted 43 climate change 43 particulate matter PM 43 greenhouse gas emitters 43 NOx emissions 43 diesel 43 renewable energy 43 heat trapping carbon dioxide 42 Greenhouse gases 42 heat trapping gases 42 Carbon Emissions 42 Amazon deforestation 42 nitrogen oxide NOx 42 carbon emitters 42 Low Carbon 42 carbon emitting 42 fleetwide average 42 zero emission 42 heat trapping emissions 42 gigatonnes 42 fossil fuels 42 biofuel 41 tropical deforestation 41 carbon 41 nitrogen oxides NOx 41 ratify Kyoto 41 Waxman Markey 41 heat trapping greenhouse gases 41 carbon footprint 41 sulfur dioxide emissions 41 ozone depleting chemicals 41 ratified Kyoto 41 particulate emissions 41 gasohol 41 Greenhouse Gases 41 Carbon Dioxide 41 NOx