Related by context. Frequent words. (Click for all words.) 67 emission 66 CO2 emission 65 carbon dioxide emission 63 emissions 63 carbon emission 61 carbon dioxide emissions 61 CO2 emissions 60 carbon emissions 59 pollutant emissions 58 greenhouse gas emissions 58 C# emissions 58 greenhouse emissions 57 CO2 57 greenhouse gas emission 56 greenhouse gasses 56 GHGs 56 greenhouse gas 56 exhaust emissions 56 greenhouse gases 55 Co2 54 carbon 54 NOx emissions 54 particulate emissions 53 carbon dioxide CO2 emissions 53 NOx 53 greenhouse gas GHG emissions 53 reduce carbon emissions 53 emission reductions 52 emission reduction 52 GHG emissions 52 reducing carbon emissions 52 Carbon dioxide emissions 51 tailpipe emissions 51 greenhouse gas GHG 51 nitrous oxide emissions 51 carbon dioxide 51 GHG 51 pollutant 50 carbon emitting 50 pollution 50 greenhouses gases 49 carbon dioxide CO2 49 Emission 49 reducing CO2 emissions 48 Emissions 48 nitrogen oxide emissions 48 CO2 emitted 48 nitrogen oxide 48 zero emission 47 NO2 47 air pollution 47 nitrogen oxides 47 fossil fuel 47 greenhouse gases emitted 47 sulfur dioxide emissions 46 global warming gases 46 efficiency 46 carbon dioxide emitted 46 SO2 46 emit carbon dioxide 45 polluting 45 particulate matter 45 mercury emissions 45 pollutants 45 emitting 45 fossil fuels 44 carbon emitted 44 renewables 44 greenhouse gas concentrations 44 diesel 44 heat trapping carbon dioxide 44 renewable energy 44 HCFC 44 emit greenhouse gases 44 Greenhouse gases 44 warming gases 44 biomass 44 emitters 44 airborne pollutants 44 carbon emitters 43 atmospheric CO2 43 carbon footprints 43 sulfur 43 sulfur dioxide 43 cleaner fuels 43 air toxics 43 particulate pollution 43 atmospheric concentrations 43 ozone 43 nitrogen dioxide 42 carbon footprint 42 nitrogen 42 consumptions 42 renewable 42 carbons 42 heat trapping emissions 42 usage 42 particulates 42 emit 42 alternative fuels 42 bio fuels