Related by context. Frequent words. (Click for all words.) 76 atmospheric CO2 72 atmospheric carbon dioxide 71 CO2 concentrations 61 greenhouse gas concentrations 59 Fig. 59 atmospheric concentrations 58 greenhouse warming 57 CO2 57 albedo 57 anthropogenic 56 troposphere 56 decadal 56 sunspot activity 55 carbon dioxide 54 Co2 54 extinctions 54 atmospheric circulation 54 carbon dioxide CO2 54 GHGs 54 water vapor 53 glaciation 53 fluxes 53 ^ sub 53 abundances 53 atmospheric 53 conductance 53 phytoplankton 52 mid latitudes 52 Medieval Warm Period 52 glacial melt 52 mass extinctions 52 greenhouse gases 52 isotopic 52 pH 52 Pliocene 52 photosynthetic 52 earths 52 acidification 52 greenhouse gasses 51 diatoms 51 ozone depletion 51 perturbation 51 magnetization 51 oscillations 51 Little Ice Age 50 nitrous oxide emissions 50 polar caps 50 sulfate 50 salinity 50 Holocene 50 biosphere 50 mass extinction 50 methane 50 volcanism 50 anoxic 50 anthropogenic climate 50 β 49 ^ sup 49 Greenhouse gases 49 CO 49 permafrost 49 NO2 49 Greenland ice 49 seismicity 49 evapotranspiration 49 gigatons 49 deuterium 49 Serreze 49 Carbon Dioxide 49 olivine 49 sediments 49 melting permafrost 49 crustal 49 ozone concentrations 48 oxygenation 48 ref. 48 streamflow 48 redox 48 perturbations 48 nitrogen 48 radiocarbon 48 photosynthesis 48 redshift 48 ° C 48 airborne pollutants 48 Tibetan Plateau 48 dissolved oxygen 47 degree centigrade 47 temperature 47 º C 47 invariant 47 thermodynamic 47 ozone 47 latitudes 47 GHG emissions 47 #ppm [001] 47 greenhouse gas 47 carbon sinks 47 greenhouse emissions 47 geomagnetic field 47 alkalinity