Related by context. Frequent words. (Click for all words.) 63 Little Ice Age 63 El Ninos 63 glaciation 60 mass extinctions 59 Medieval Warm Period 58 Holocene 57 climatological 57 volcanism 56 sunspot activity 55 Droughts 55 Pliocene 55 El Niño 54 extinctions 54 greenhouse warming 53 Pleistocene 53 ENSO 53 mass extinction 53 CO2 concentrations 53 megafauna 53 Ice Age 53 glacial melt 52 species extinctions 52 temperate regions 52 droughts 52 temperate zones 52 tropics 51 mid latitudes 51 milder winters 51 volcanic eruptions 51 epochs 51 decadal 51 atmospheric circulation 51 El Nino 51 climatic 51 warmer winters 51 Tibetan Plateau 50 atmospheric CO2 50 glaciers 50 atmospheric carbon dioxide 50 greenhouse gas concentrations 50 anthropogenic 50 plate tectonics 50 millenniums 49 Sunspots 49 Fertile Crescent 49 monsoon rainfall 49 PETM 49 La Niña 49 sunspots 49 melting permafrost 49 anthropogenic climate 49 Late Cretaceous 49 millennia 49 aridity 49 Climatic 49 Eruptions 49 millenia 49 atmospheric concentrations 49 mountain glaciers 48 glacier melt 48 geologic 48 warmer temperatures 48 speciation 48 northern latitudes 48 geomagnetic 48 influenza pandemics 48 El Nino phenomenon 48 Global Warming 48 coral bleaching 48 landmasses 47 polar caps 47 Ordovician 47 flu pandemics 47 diatoms 47 volcanic activity 47 latitudes 47 nitrogen fixation 47 Eocene 47 upwelling 47 gigatonnes 47 icecap 47 famines 47 prehistory 47 mammoths 47 equatorial Pacific 47 La Nina 46 wetter 46 glacial 46 Patzert 46 sediment cores 46 lowlands 46 El Niño phenomenon 46 cataclysms 46 winters 46 sunspot 46 equatorial regions 46 Mesozoic 46 Industrial Revolution 46 streamflow 46 Antarctica 45 Northern Hemisphere