Related by context. Frequent words. (Click for all words.) 54 carbon dioxide emission 52 greenhouse gas 52 carbon emission 51 greenhouse gas emission reductions 51 greenhouse gases 50 carbon emissions 50 emission 50 greenhouse gas emission 50 carbon dioxide emissions 50 CO2 50 emissions 49 greenhouse gas GHG 49 greenhouse gas emissions 49 CO ² 49 carbon dioxide 49 Carbon Dioxide 49 GHG emission 48 carbon dioxide CO2 48 greenhouse gasses 47 nitrous oxide emissions 47 GHG 47 CO2 emissions 47 greenhouse gas GHG emissions 47 CO2 emission 47 emission reduction 47 pollutant emissions 47 carbon emission reductions 47 greenhouse emissions 46 SO2 emissions 46 sulfur dioxide SO2 46 carbon 46 heat trapping carbon dioxide 46 emission reductions 46 Greenhouse Gas 46 carbon credits 45 GHGs 45 CO2 emitted 45 GHG emissions 44 HCFC 44 C# emissions 44 greenhouses gases 44 nitrous oxides 44 Greenhouse Gases 44 pollution 44 VOC emissions 44 reduce carbon emissions 43 plasma gasification 43 carbon dioxide CO2 emissions 43 Greenhouse Gas Emissions 43 carbon emitted 43 Emissions 43 mechanism CDM 43 CO2e 42 livestock manure 42 nitrogen oxides NOx 42 flue gases 42 carbon sequestration 42 SOx 42 greenhouse gases emitted 42 sulfur oxide 42 heat trapping emissions 42 particulate emissions 42 smokestack emissions 41 exhaust emissions 41 sulfur fuels 41 carbon dioxide emitted 41 CO2 Emissions 41 harmful gases 41 Carbon Emissions 41 reducing carbon emissions 41 ozone depleting chemicals 41 sequester carbon 41 particulate matter emissions 41 atmospheric carbon dioxide 41 biomass 41 SO2 40 GHG reduction 40 emission allowances 40 Biochar 40 isoprene 40 nitrogen oxide NOx 40 technologically feasible 40 NOx emissions 40 Emissions Trading Scheme ETS 40 emitting carbon dioxide 40 ozone depleting 40 pollutant 40 emit carbon dioxide 40 reducing CO2 emissions 40 sulfur dioxide 40 Carbon Reduction 40 NOx 40 greenhouse gas emitting 40 absorbing carbon dioxide 40 heat trapping gases 39 mercury emissions 39 disposable plastic bags 39 biomass feedstock 39 largest emitter 39 greenhouse gas emitters 39 Geoengineering