Related by context. Frequent words. (Click for all words.) 57 greenhouse warming 53 anthropogenic 53 atmospheric circulation 52 glacial melt 52 volcanism 52 mid latitudes 51 atmospheric chemistry 51 anthropogenic climate 51 ozone depletion 51 atmospheric CO2 51 greenhouse gas concentrations 50 biosphere 50 crustal 50 sunspot activity 50 upwelling 50 El Ninos 50 radiative 49 polar regions 49 perturbations 49 equatorial regions 49 tectonics 48 geomagnetic storms 48 ocean currents 48 convective 48 magnetosphere 48 polar caps 48 Greenland glaciers 47 atmospheric carbon dioxide 47 ecosystems 47 nitrogen fixation 47 dynamical 47 atmospheric concentrations 47 geomagnetic field 47 water vapor 47 Greenland ice 47 Greenland Ice 47 phytoplankton 47 Little Ice Age 47 ocean acidification 47 convection 46 landmasses 46 troposphere 46 permafrost 46 acidification 46 species extinctions 46 glaciation 46 meltwater 46 Medieval Warm Period 46 glacier melt 46 temperature gradient 46 subduction zones 45 oscillations 45 Tibetan Plateau 45 biochemical processes 45 mountain glaciers 45 geomagnetic storm 45 X ray emission 45 Southerly winds 45 climate change 45 CO2 concentrations 45 diatoms 45 plate tectonics 45 ENSO 45 methane 45 climatological 45 volcanic gases 44 oscillation 44 Sulfur dioxide 44 temperate zones 44 El Nino phenomenon 44 carbon sinks 44 albedo 44 nutrient runoff 44 climatic 44 extinctions 44 snow melt 44 sediments 44 continental drift 44 North Atlantic Oscillation 44 polar 44 perturbation 44 interstellar medium 44 currents 44 ocean ecosystems 44 glaciers 44 biotic 43 sebaceous glands 43 vortices 43 gas hydrates 43 Serreze 43 stomata 43 biota 43 zooplankton 43 hydrothermal 43 NSIDC 43 speciation 43 oxygen depletion 43 global warming 43 coronal mass ejections 43 decadal 43 melting permafrost