Related by context. Frequent words. (Click for all words.) 70 Little Ice Age 70 Medieval Warm Period 54 glaciation 52 sunspot activity 51 Holocene 51 mass extinctions 50 droughts 49 atmospheric CO2 49 sunspots 48 Pliocene 48 aridity 48 degree Fahrenheit 48 climatological 48 El Niño 48 climatologists 48 Droughts 47 Climatologists 47 greenhouse warming 47 millenniums 47 climatology 47 epochs 47 temperate regions 47 millennia 46 atmospheric carbon dioxide 46 Industrial Revolution 46 Mayan civilization 46 mid latitudes 46 atmospheric concentrations 46 ENSO 46 heatwaves 46 climatic 45 coldest winter 45 Fertile Crescent 45 temperate 45 monsoon rainfall 45 warmer temperatures 45 greenhouse gas concentrations 45 extinctions 45 vernal equinox 45 Ice Age 44 Pleistocene 44 volcanism 44 hunter gatherers 44 sunspot 44 Periods 44 megafauna 44 mountain glaciers 44 degree centigrade 44 prehistory 44 decadal 44 degrees warmer 44 Saturnalia 44 Middle Ages 44 La Niña 44 warming 44 famines 43 Roman Empire 43 Byzantine Empire 43 warmest 43 desiccation 43 volcanic eruptions 43 temperatures 43 mass extinction 43 unusually warm 43 Han Dynasty 43 latitudes 43 winterkill 43 precipitations 43 atmospheric circulation 43 millenia 43 winter solstice 43 anthropogenic 42 Climatic 42 Northern Hemisphere 42 epoch 42 milder winters 42 La Nina 42 upwelling 42 degrees Fahrenheit 42 warmer 42 climate 42 influenza pandemics 42 autumnal equinox 42 El Nino 42 northern latitudes 42 mammoths 42 daytime temperatures 42 Dark Ages 42 precipitation 41 balmy temperatures 41 colder 41 Serreze 41 Augusts 41 coldest 41 floods droughts 41 Mayans 41 tropical cyclones 41 #.#C [002] 41 Babylonians 41 climatic conditions 41 degree Celsius