Related by context. Frequent words. (Click for all words.) 61 CO2 60 atmospheric CO2 57 carbon dioxide 55 greenhouse warming 55 atmospheric carbon dioxide 55 Co2 54 CO2 emitted 54 GHGs 53 carbon dioxide CO2 53 greenhouse gas concentrations 53 greenhouse gasses 52 methane 52 greenhouse gases 52 nitrous oxide emissions 51 anthropogenic 51 water vapor 51 atmospheric concentrations 51 carbon dioxide emissions 51 Carbon Dioxide 49 airborne pollutants 49 fluxes 49 gigatons 49 carbon emitted 48 ozone depletion 48 CO2 emissions 48 sequester carbon 48 nitrogen 48 C# emissions 48 albedo 48 NOx emissions 48 Greenhouse gases 47 carbon sinks 47 GHG emissions 47 carbon emissions 47 carbons 46 greenhouse gas 46 pollutants 46 carbon sequestration 46 Carbon dioxide 46 greenhouse emissions 46 fossil fuels 46 emissions 46 Carbon dioxide emissions 46 biomass 46 fossil fuel 46 mass extinctions 46 biosphere 45 atmospheric circulation 45 emission reductions 45 absorb carbon dioxide 45 particulate emissions 45 aerosols 45 pollutant 45 carbon dioxide CO2 emissions 45 greenhouse gas emissions 45 earths 45 heat trapping carbon dioxide 44 pollutant emissions 44 carbon dioxide emitted 44 NOx 44 greenhouse gas GHG emissions 44 atmospheric chemistry 44 troposphere 44 ozone 44 Fossil fuels 44 Nitrogen 44 Little Ice Age 44 SO2 44 radionuclide 44 sulfur dioxide 44 carbon 44 hydrocarbons 44 greenhouses gases 44 reducing carbon emissions 44 Greenhouse Gases 43 dissolved oxygen 43 gases 43 burning fossil fuels 43 ENSO 43 GHG 43 atmospheric 43 photosynthesis 43 perturbation 43 algal 43 CO 43 Methane 43 perturbations 43 renewables 43 acidification 43 chlorofluorocarbons 43 phytoplankton 43 evaporative 43 sulfur dioxide emissions 43 warming gases 43 mid latitudes 43 photosynthetic 43 combustion 43 salinity 42 radioactive decay 42 oxidant 42 volcanism