Related by context. Frequent words. (Click for all words.) 61 Medieval Warm Period 60 geologic 59 sediment cores 58 glaciation 57 paleontological 56 volcanism 55 ENSO 55 greenhouse warming 54 geological 54 radiocarbon 54 Little Ice Age 54 Pliocene 54 plate tectonics 53 climatological 53 climatologists 53 paleo 53 tectonics 52 decadal 52 fossil 52 atmospheric circulation 52 isotopic 52 climatology 52 fossils 52 NSIDC 51 mid latitudes 51 crustal 51 atmospheric CO2 51 megafauna 51 streamflow 51 atmospheric chemistry 51 atmospheric carbon dioxide 51 mass extinctions 50 Greenland ice 50 Eocene 50 polar regions 50 geochemical 50 glaciers 50 magmatic 50 sunspot activity 50 mineralogy 50 mountain glaciers 50 landforms 50 Serreze 50 Antarctic ice 49 Landsea 49 Nature Geoscience 49 radiocarbon dating 49 extinctions 49 dynamical 49 anthropogenic 49 Antarctica 48 permafrost 48 Antarctic Ice 48 geochemistry 48 geology 48 Pleistocene 48 GISS 48 greenhouse gas concentrations 48 climatic 48 Oetzi 48 prehistory 48 cosmological 47 Pielke 47 seismicity 47 Climatologists 47 troposphere 47 IceCube 47 geomagnetic 47 polar ice 47 Tibetan Plateau 47 Holocene 47 phylogenetic 47 oceanic 47 cometary 47 astrophysical 47 abundances 47 MWP 47 Ordovician 47 palaeontologist 47 geophysical 47 temperate regions 46 spectroscopic 46 computer simulations 46 hydrologic 46 palaeontologists 46 geoscientist 46 geosciences 46 WMO 46 hydrological 46 equatorial 46 observational 46 journal Geophysical Research 46 stratigraphy 46 National Climatic Data 46 Archaeopteryx 46 World Meteorological Organization 46 albedo 46 USGS 46 Precambrian 46 subsurface 46 glacial ice