Related by context. Frequent words. (Click for all words.) 51 gas hydrates 50 methane hydrates 49 methane hydrate 49 melting permafrost 48 Serreze 48 greenhouse warming 48 glacial melt 48 subtropical regions 47 Permafrost 47 gigatonnes 47 glacier melt 47 Geochemistry 46 methane 46 journal Geophysical Research 46 Weddell Sea 46 glaciers melt 45 hydrological cycle 45 Tibetan Plateau 45 earth crust 45 Antarctic ice 45 Nature Geoscience 44 Geophysical Research 44 marine sediments 44 terrestrial ecosystems 44 Antarctica 44 Antarctic Ice 44 volcanism 44 interglacial 44 equatorial Pacific Ocean 44 Qinghai Tibet Plateau 44 volcanically active 44 Greenland ice 43 gigatons 43 atmospheric concentrations 43 permafrost 43 oceanic crust 43 NSIDC 43 Greenland Ice 43 troposphere 43 journal Geology 43 Arctic Ocean 43 retreating glaciers 43 Amstrup 43 glaciologists 43 aerosol particles 43 Finnish Meteorological 42 Volcanic eruptions 42 atmospheric CO2 42 astrobiologists 42 volcanic gases 42 CO2 concentrations 42 Ocean acidification 42 greenhouse gas concentrations 42 lithosphere 42 polar ice 42 polar regions 42 Kola Peninsula 42 Colaprete 41 geologically active 41 mass extinction 41 species extinctions 41 icecap 41 oceanographers 41 river deltas 41 atmospheric carbon dioxide 41 sediment cores 41 anthropogenic 41 Saturn moon Enceladus 41 meltwater 41 earths 41 MARSIS 41 mid latitudes 41 ocean acidification 41 oceans 41 temperate zones 41 mountain glaciers 41 hydrothermal vents 41 Quaternary 40 British Antarctic Survey 40 Greenland glaciers 40 equatorial regions 40 melting glaciers 40 volcanic eruptions 40 Meehl 40 plate tectonics 40 radioactive decay 40 acidification 40 IPY 40 ocean acidity 40 WMO 40 Antarctic 40 atmospheric 40 lunar poles 40 WEO 40 subduction zone 40 geological sciences 40 anthropogenic climate 40 continental drift 40 glaciers 40 icecaps 40 Earth crust