Related by context. Frequent words. (Click for all words.) 67 carbon dioxide 65 methane 65 greenhouse gasses 64 carbon dioxide CO2 63 heat trapping carbon dioxide 63 N2O 62 CO2 61 greenhouse gases 60 nitrous oxide emissions 59 GHGs 59 Sulfur dioxide 59 harmful pollutants 58 Co2 58 Carbon dioxide 57 CO2 emitted 57 Greenhouse gases 57 greenhouse gas 57 Carbon Dioxide 57 carbon sinks 57 warming gases 57 harmful gases 57 water vapor 56 Methane 56 greenhouses gases 56 dioxide 55 carbon emitted 55 pollutants 55 pollutant 54 carbon dioxide methane 54 atmospheric CO2 54 sulfur dioxide 54 crop residues 54 atmospheric carbon dioxide 53 gases 53 toxic pollutants 53 sequester carbon 53 gigatons 53 gasses 53 greenhouse gases emitted 52 absorb carbon dioxide 52 Carbon dioxide emissions 52 CH4 52 carbons 52 furans 52 carbon dioxide emissions 52 carbon dioxide emitted 52 nitrogen fertilizers 52 nitrogen 52 burning fossil fuels 52 gigatonnes 51 livestock manure 51 CO2 concentrations 51 chlorofluorocarbons CFCs 51 heat trapping 51 HCFC 51 carbon 51 polluting 51 flue gases 51 ozone depleting 51 ozone depletion 51 Fossil fuels 51 environmentally harmful 51 fossil fuel 50 oxidizes 50 CFCs 50 ozone depleting substances 50 acidic 50 nitrogen oxides 50 greenhouse emissions 50 greenhouse gas emissions 50 acid rain 50 heat trapping gases 50 emit carbon dioxide 50 sulfuric 50 Greenhouse Gases 50 gaseous 50 chlorofluorocarbons 50 greenhouse warming 50 carbon emissions 50 SO2 49 noxious gases 49 melting permafrost 49 Ammonia 49 toxic byproducts 49 pollution 49 Anhydrous ammonia 49 fungal spores 49 megatons 49 toxic gases 49 particulate emissions 49 aerosols 49 oxidants 49 oxidant 49 emissions 48 VOCs 48 fossil fuels 48 NOx 48 particulates 48 harmful toxins 48 anthropogenic 48 nitrogen oxides NOx