Related by context. Frequent words. (Click for all words.) 75 CO2 73 carbon dioxide 69 carbon dioxide CO2 66 greenhouse gases 64 greenhouse gas 64 greenhouse gasses 64 GHGs 62 carbon dioxide emissions 61 emissions 60 Carbon Dioxide 59 CO2 emissions 59 NOx 59 carbon emissions 58 methane 58 Carbon dioxide 58 GHG 58 greenhouse gas emissions 57 carbon 57 GHG emissions 57 nitrogen 57 pollutants 57 carbon dioxide emission 56 sulfur dioxide 56 emission 55 greenhouse emissions 55 atmospheric CO2 55 gases 55 carbon dioxide emitted 55 SO2 55 carbon dioxide CO2 emissions 55 pollutant 53 atmospheric carbon dioxide 53 emission reductions 53 greenhouse gas GHG emissions 53 nitrogen oxide 53 greenhouse gas emission 53 fossil fuel 53 sulfur dioxide emissions 53 carbon emission 53 water vapor 52 gasses 52 heat trapping gases 52 fossil fuels 51 nitrogen oxides 51 pollution 51 VOCs 51 Emissions 51 global warming gases 50 CO2 emission 50 sulfur 50 mercury emissions 50 tailpipe emissions 49 ammonia 49 nitrogen oxide emissions 49 heat trapping greenhouse gases 49 flue gas 49 emission reduction 48 carbon sequestration 48 Methane 47 carbon capture 47 particulates 47 nitrogen fertilizer 47 particulate matter 47 CFCs 47 mercury pollution 47 CO 47 exhaust emissions 47 acid rain 46 carbon sinks 46 reduce carbon emissions 46 mercury 46 heat trapping 46 vapor 46 hydrocarbons 46 ozone 46 combustion 46 air pollution 46 reducing carbon emissions 46 toxic chemicals 45 nitrous oxide 45 emitters 45 Ammonia 45 gaseous 45 reducing CO2 emissions 45 syngas 45 hydrogen sulphide 45 Greenhouse Gas 44 hydrogen 44 exhaust gases 44 hydrogen sulfide 44 carbon emitting 44 volatile organic compounds 44 burning fossil fuels 44 nitrate 44 polluters 44 sulfuric acid 44 biomass 44 greenhouse gas emitters 44 coal 44 ethane 43 particulate pollution