Related by context. Frequent words. (Click for all words.) 72 GHGs 67 greenhouse gasses 67 greenhouse gases 63 GHG 62 greenhouse gas emissions 62 greenhouse gas 62 greenhouse gas GHG emissions 62 carbon emissions 62 GHG emissions 60 carbon dioxide emissions 60 greenhouse emissions 59 emissions 59 carbon dioxide CO2 59 CO2 emissions 59 carbon dioxide 59 CO2 58 carbon emission 57 Greenhouse gases 57 pollutant emissions 56 carbon dioxide CO2 emissions 56 greenhouse gas emission 56 pollutants 55 greenhouse gases emitted 55 emission 55 pollutant 55 particulate emissions 55 CO2 emission 54 Carbon Dioxide 54 C# emissions 54 pollution 54 heat trapping gases 54 gases 53 toxic pollutants 53 Emissions 53 carbon dioxide emission 53 SO2 53 carbon 52 ozone depleting substances 52 emission reductions 52 reducing carbon emissions 52 harmful gases 51 heat trapping greenhouse gases 51 Carbon dioxide 51 harmful pollutants 51 methane 51 NOx emissions 50 NOx 50 reduce carbon emissions 50 carbon dioxide methane 50 exhaust emissions 50 heat trapping emissions 50 greenhouse gas emitters 50 climate change 50 reducing CO2 emissions 50 CFCs 50 global warming gases 49 particulate matter 49 air pollution 49 ozone depletion 49 carbon dioxide emitted 49 greenhouse gas concentrations 48 sulfur dioxide 48 particulates 48 mercury emissions 48 acid rain 48 emission reduction 48 atmospheric CO2 48 Greenhouse Gas 48 fossil fuels 48 atmospheric carbon dioxide 47 nitrogen oxide 47 ozone 47 nitrogen oxides 47 tailpipe emissions 47 sulfur dioxide emissions 47 carbon emitting 47 carbon emitters 47 nitrogen oxide emissions 46 nutrient pollution 46 Emission 46 fossil fuel 46 megatonnes 46 burning fossil fuels 46 heat trapping 46 particulate pollution 46 gasses 46 Waxman Markey 46 Montreal Protocol 46 hydrocarbons 45 global warming 45 water vapor 45 oceans 45 emitters 45 particulate 45 aerosols 45 chlorofluorocarbons 45 Emissions Trading Scheme 45 fine particulate matter 45 carbon sinks 45 emit carbon dioxide 45 anthropogenic