Related by context. Frequent words. (Click for all words.) 66 interglacial 59 Little Ice Age 59 glaciation 57 Pliocene 57 Medieval Warm Period 55 Late Cretaceous 55 Holocene 55 Eocene 54 El Ninos 53 Quaternary 53 mass extinctions 52 sunspot numbers 52 Ordovician 52 volcanism 52 sunspot activity 52 Cretaceous Period 52 sunspot cycle 52 mid latitudes 52 Pleistocene 51 epochs 51 storminess 50 lithosphere 50 decadal 50 abundances 50 temperate zones 50 subtropical regions 49 irradiance 49 radiocarbon 49 equatorial regions 49 lake sediments 49 terrestrial ecosystems 49 CO2 concentrations 48 maxima 48 Carboniferous 48 latitudes 48 marine sediments 48 basalts 48 atmospheric circulation 48 atmospheric CO2 47 #.#C [002] 47 atmospheric carbon dioxide 47 prolonged droughts 47 glacial melt 47 atmospheric concentrations 47 oxygen isotopes 47 taxa 47 Oligocene 47 Precambrian 47 Paleozoic 47 landmasses 47 hydrological cycle 47 Cretaceous 47 geomagnetic field 47 minima 46 equatorial Pacific 46 sunspots 46 species extinctions 46 greenhouse warming 46 sunspot 46 gigatonnes 46 temperate regions 46 equinoxes 45 preindustrial 45 Mesozoic 45 ˚ C 45 anomalously 45 greenhouse gas concentrations 45 cirrus clouds 45 troposphere 45 aridity 45 ° C 45 oscillations 45 monsoon rainfall 45 isotopic 45 NSIDC 45 diatoms 45 degrees warmer 44 extinctions 44 geomagnetic 44 mountain glaciers 44 northern latitudes 44 megafauna 44 landforms 44 super Earths 44 Sunspots 44 morphologies 44 desiccation 44 meltwater 44 sediments 44 temperate climates 44 aerosol particles 44 heatwaves 44 Weddell Sea 44 Neandertals 44 glaciers 44 substorms 44 oscillation 43 polar regions 43 equatorial 43 hotter summers 43 thermocline