Related by context. Frequent words. (Click for all words.) 55 NSIDC 55 Serreze 52 Greenland ice 47 greenhouse warming 46 mountain glaciers 46 Antarctic ice 46 glacial ice 45 decadal 45 Greenland 45 polar ice 44 glaciers 44 meltwater 44 journal Geophysical Research 43 atmospheric CO2 43 Overpeck 43 Meehl 43 atmospheric carbon dioxide 42 Nature Geoscience 42 Arctic Ocean 42 Antarctic Peninsula 41 sediment cores 41 WMO 41 atmospheric concentrations 41 glacier 41 glaciologist 41 National Climatic Data 41 Steig 41 mass extinction 40 polar caps 40 glaciation 40 melting glaciers 40 atmospheric circulation 40 sunspot activity 40 Himalayan glaciers 40 Antarctic Ice 40 journal Nature Geoscience 39 World Meteorological Organization 39 melting permafrost 39 melting ice 39 GOCE 39 streamflow 39 plate tectonics 39 volcanism 39 extinctions 39 UN Intergovernmental Panel 38 Little Ice Age 38 narwhal 38 melting 38 mass extinctions 38 abundances 38 Jarraud 38 NASA Cassini spacecraft 38 greenhouse gas concentrations 37 geologic 37 atmospheric chemistry 37 IPCC 37 polar bear populations 37 gas hydrates 37 Hadow 37 World Meteorological Organisation 37 Trenberth 37 acidification 37 crustal 37 mountain snowpack 37 Antarctica 37 sunspot 37 monsoon rainfall 37 Geophysical Research 37 USGS 37 Ordovician 37 ozone depletion 37 snowpack 36 British Antarctic Survey 36 ocean acidification 36 NOAA Climate Prediction 36 warmest 36 snowpacks 36 mid latitudes 36 permafrost 36 Eocene 36 lake sediments 36 stalagmites 36 GISS 36 dataset 36 coral bleaching 36 Arctic 36 Medieval Warm Period 36 IPY 36 Ellesmere Island 36 polar regions 36 Santer 36 Pliocene 36 climatologists 35 State Climatologist 35 Intergovernmental Panel 35 WEO 35 landforms 35 graphed 35 climatological 35 oceanographers 35 Snowpack