Related by context. Frequent words. (Click for all words.) 62 radiative forcing 61 atmospheric CO2 61 greenhouse gas concentrations 60 anthropogenic 59 greenhouse gases GHG 59 atmospheric CO 58 atmospheric concentrations 57 Greenhouse gases 57 atmospheric carbon dioxide 56 CO2 concentrations 55 preindustrial 55 nitrous oxides 55 greenhouse gases 55 ocean acidity 55 greenhouse warming 55 GHGs 55 hydrological cycle 55 Carbon dioxide emissions 55 species extinctions 54 terrestrial ecosystems 54 greenhouse gasses 54 nitrous oxide emissions 54 #.#C [004] 54 Little Ice Age 54 carbon dioxide methane 54 ozone depletion 53 GHG emission 53 anthropogenic climate 53 gigatonnes 52 stratospheric ozone 52 SO2 emissions 52 interglacial period 52 sulfur dioxide SO2 52 albedo 51 aerosol particles 51 CO ² 51 preindustrial levels 51 Sulfur dioxide 51 ozone concentrations 51 Medieval Warm Period 51 pollutant 50 burning fossil fuels 50 extinctions 50 isoprene 50 carbon dioxide 50 heat trapping gases 50 Carbon dioxide 50 biogenic 50 overhunting 50 sunspot activity 50 gigatons 50 greenhouse gas emissions 50 GHG reductions 50 heat trapping carbon dioxide 50 emissions 50 mid latitudes 50 airborne pollutants 49 greenhouse gas 49 nitrogen oxides NOx 49 methane 49 greenhouse emissions 49 CO2 49 subtropical regions 49 glacial melt 49 warming gases 49 Saturated fat 49 carbon dioxide CO2 49 exceedances 49 incomplete combustion 49 fine particulate 48 SO2 48 greenhouse gases emitted 48 ozone depleting chemicals 48 GHG 48 largest emitter 48 GHG emissions 48 prolonged droughts 48 methyl mercury 48 atmospheric circulation 48 interglacial 48 ruminant animals 48 gases emitted 48 Younger Dryas 48 El Ninos 48 N2O 47 emission reductions 47 atmospheric 47 marine sediments 47 #ppm [001] 47 sulfur dioxide nitrogen oxides 47 glacial melting 47 particulate matter emissions 47 temperate regions 47 El Nino warming 47 mass extinctions 47 decadal 47 particulate matter PM 47 particulate pollution 47 ozone 47 particulate emissions 47 carbon dioxide emissions