Related by context. Frequent words. (Click for all words.) 70 interglacial 68 interglacial period 61 Pliocene 59 equatorial Pacific Ocean 58 Medieval Warm Period 58 Little Ice Age 56 Polar Regions 54 Late Cretaceous 53 hydrological cycle 53 glaciation 52 subtropical regions 52 El Ninos 52 decadal 51 Eocene 51 lithosphere 51 continental crust 51 Cretaceous Period 51 atmospheric CO 51 Pleistocene 51 MWP 50 CO2 concentrations 50 preindustrial 50 Quaternary 50 Holocene 50 PETM 50 mountain glaciers 49 equatorial Pacific 49 equatorial regions 49 sunspot activity 49 greenhouse gas concentrations 49 degrees warmer 49 sunspot cycle 49 sunspot numbers 49 NSIDC 49 irradiance 49 ENSO 49 #.degree [001] 48 terrestrial ecosystems 48 oceanic crust 48 lake sediments 48 permafrost 48 temperate regions 48 Ordovician 48 atmospheric circulation 48 polar regions 48 atmospheric CO2 47 marine sediments 47 degrees Centigrade 47 º C 47 gigatonnes 47 Precambrian 47 ° C 47 mid latitudes 47 ˚ C 47 Serreze 47 geomagnetic field 47 atmospheric concentrations 47 #.#C [002] 47 tropics 47 storminess 47 Cretaceous 47 Weddell Sea 46 latitudes 46 glacial melting 46 epochs 46 Permafrost 46 polar caps 46 degrees Fahrenheit 46 temperate zones 46 Ross Ice Shelf 46 warmer 46 greenhouse warming 46 monsoon rainfall 46 glacier melt 46 atmospheric carbon dioxide 46 troposphere 46 degree centigrade 46 lavas 46 volcanism 46 degrees Celsius 45 Antarctic Peninsula 45 IPY 45 Tibetan Plateau 45 methane hydrates 45 geologic 45 Greenland Ice 45 sediment cores 45 drylands 45 Antarctica 45 glacial 45 icecap 45 Carboniferous 45 plate tectonics 45 glacial ice 45 crustal 45 anoxic 45 microfossils 45 albedo 44 Ice Age 44 Jarraud 44 glacial melt