Related by context. Frequent words. (Click for all words.) 57 Serreze 50 Palumbi 50 Landsea 49 Overpeck 48 Pielke 48 Trenberth 47 extinctions 47 Kreil 46 glaciologist 46 journal Nature Geoscience 46 Steig 46 greenhouse warming 46 mountain glaciers 45 climatologists 45 glacial melt 45 Greenland glaciers 45 Nature Geoscience 45 Hueter 45 NSIDC 45 ocean acidification 45 polar bear populations 45 gigatonnes 45 atmospheric CO2 44 biologist 44 USGS scientist 44 Meehl 44 pikas 43 El Ninos 43 conservation biologist 43 narwhal 43 glaciers 43 Patzert 43 Diffenbaugh 43 atmospheric chemistry 43 Servheen 43 ocean ecosystems 43 Himalayan glaciers 43 species extinctions 43 marine ecosystems 42 megafauna 42 journal Geophysical Research 42 Scripps Institution 42 fishery biologist 42 polar bears 42 marine ecologist 42 Nickelsburg 42 zoologist 42 geoscientist 42 extinction 42 atmospheric concentrations 42 polar bear habitat 41 Ruckelshaus 41 Millennium Ecosystem Assessment 41 kelp forests 41 University Lamont Doherty 41 British Antarctic Survey 41 Arctic Ocean 41 Polar bears 41 acidification 41 NOAA Climate Prediction 41 Conservation Biology 41 anthropogenic climate 41 polar bear 40 oceanographer 40 Lubchenco 40 Worldwatch 40 Lake Turkana 40 Revkin 40 mid latitudes 40 Jarraud 40 atmospheric carbon dioxide 40 Climatic Research Unit 40 Lautenbacher 40 Nordhaus 40 boreal forests 40 glaciologists 40 atmospheric scientist 40 paleoanthropologist 40 atmospheric circulation 40 permafrost 40 melting permafrost 40 IPCC 40 climatologist 40 global warming 40 Hatzius 40 CO2 concentrations 40 melting Arctic 39 marbled murrelet 39 Lomborg 39 IUCN 39 mass extinctions 39 ecologist 39 Ebbesmeyer 39 journal Geology 39 polar caps 39 Pachauri 39 Climatologists 39 Global warming 39 oceanographers 39 greenhouse gas concentrations 39 geoengineering