Related by context. Frequent words. (Click for all words.) 55 hydrological cycle 54 glacial melting 52 acidification 51 species extinctions 51 greenhouse warming 51 oxygen depletion 51 melting permafrost 51 glaciers melt 51 terrestrial ecosystems 50 atmospheric circulation 50 glacial melt 50 thawing permafrost 49 Greenland glaciers 49 permafrost 49 atmospheric CO 49 nitrogen fixation 48 ocean acidity 48 eutrophication 48 Severe drought 48 atmospheric CO2 48 El Nino warming 47 mountain glaciers 47 hotter summers 47 upwelling 47 toxic algae blooms 47 extinctions 46 Ocean acidification 46 Greenland ice 46 forest ecosystems 46 habitat fragmentation 46 stratospheric ozone 46 atmospheric carbon dioxide 45 volcanism 45 glaciers 45 ozone depletion 45 shrinking glaciers 45 snow melt 45 acidifying 45 subduction 45 glaciers melting 45 Heavy snows 45 atmospheric concentrations 45 desiccation 45 ecosystems 45 caribou herds 45 ice jams 45 Volcanic eruptions 45 Amazon deforestation 44 chytrid fungus 44 glaciation 44 El Nino phenomenon 44 deceleration 44 Scambos 44 ocean ecosystems 44 shoreline erosion 44 ecological degradation 44 soil erosion 44 boreal forests 44 beetle infestation 44 erosion 44 Antarctic ice 44 Nickelsburg 44 degradation 44 deforestation 43 sedimentation 43 catastrophic wildfires 43 melting 43 tropical deforestation 43 pine beetle infestation 43 desertification 43 retreating glaciers 43 deformation 43 ocean acidification 43 timber harvesting 43 Sinkholes 43 Melting ice 43 aquifer recharge 43 elephant poaching 43 saltwater intrusion 43 freeze thaw cycles 43 Little Ice Age 43 snowmelt 43 tidal wetlands 43 icecaps 43 plate tectonics 43 polar bear habitat 43 marine ecosystems 43 algae blooms 43 CO2 concentrations 43 glacier melt 43 storminess 43 Urban sprawl 43 interglacial period 43 seagrasses 43 greenhouse gas concentrations 42 algal bloom 42 aquatic ecosystem 42 Younger Dryas 42 Greenland Ice 42 Amstrup 42 boreal forest