Related by context. Frequent words. (Click for all words.) 61 melting permafrost 57 Melting ice 56 Ocean acidification 56 permafrost 55 Volcanic eruptions 53 icecaps 52 methane hydrates 52 Global warming 51 stratospheric ozone 51 greenhouse warming 51 glacier melt 50 Sulfur dioxide 50 melting glaciers 50 ocean acidity 49 volcanic gases 49 protective ozone layer 49 oxygen depletion 49 retreating glaciers 49 polar ice 49 aerosol particles 49 methane 48 ocean acidification 48 Wind shear 48 ice jams 48 volcanic eruptions 48 Antarctic ice 48 hydrological cycle 48 acidification 48 ozone depletion 48 shrinking glaciers 48 glacial melt 48 melting ice 48 species extinctions 48 melting polar 47 Arctic 47 glaciers 47 atmospheric carbon dioxide 47 Carbon dioxide 47 earth crust 47 Melting snow 47 Greenland glaciers 47 atmospheric chemistry 46 polar regions 46 glacial lakes 46 peat bogs 46 greenhouse gas concentrations 46 GLOBAL WARMING 46 Greenhouse gases 46 thermosphere 45 meteoroid 45 river deltas 45 habitat fragmentation 45 icecap 45 geomagnetic storms 45 carbon dioxide 45 meltwater 45 volcano erupts 45 Arctic Ocean 45 water vapor 45 global warming 45 Arctic tundra 45 snow melt 45 mountain glaciers 45 atmospheric circulation 45 marine organisms 45 Prolonged exposure 45 Earth crust 44 volcanic plume 44 Greenland ice 44 Greenland Ice 44 volcanism 44 icebergs 44 Antarctica 44 Droughts 44 meteoroids 44 Invasive species 44 Permafrost 44 floods droughts 44 oceans 44 solar flares 44 methane hydrate 44 Sediment 44 volcano erupting 44 hotter summers 44 odorless colorless gas 43 prolonged droughts 43 geologically active 43 carbonic acid 43 Warmer temperatures 43 terrestrial ecosystems 43 lithosphere 43 gases 43 ocean currents 43 marine sediments 43 sulfur hexafluoride 43 earth tremors 43 Weddell Sea 43 soot particles 43 polycyclic aromatic hydrocarbons PAHs 43 gas hydrates 43 nitrous oxide