Related by context. Frequent words. (Click for all words.) 53 Soil erosion 52 salinization 50 deltaic 49 thawing permafrost 49 gully erosion 49 salination 48 groundwater depletion 47 streambanks 46 Three Gorges Reservoir 46 abyssal 46 erosional 46 permafrost 46 saline aquifers 45 subsidence 45 permafrost thaws 45 frequent droughts 45 porous limestone 45 graben 45 seawater intrusion 45 shallow 45 ecological degradation 45 warmer wetter 44 groundwater aquifers 44 freshwater marshes 44 refugia 44 deplete oxygen 44 coastland 44 Poyang Lake 44 silting 44 karez 44 subsurface 44 river catchments 44 recharge groundwater 44 revetments 44 hydrologic cycle 44 upwellings 43 seabeds 43 riverbank erosion 43 Celebes Sea 43 silts 43 submergence 43 cyclonic circulation 43 melting permafrost 43 seagrasses 43 rampant deforestation 43 freshwater habitats 43 clathrates 42 delicate ecosystems 42 landmasses 42 Subsidence 42 Liquefaction 42 inter tidal 42 ecologically fragile 42 river deltas 42 prolonged droughts 42 riparian zones 42 lithosphere 42 Omo River 42 melting icecaps 42 siltation 42 ponded 42 crustal 42 subglacial 42 groundwater extraction 42 Three Gorges reservoir 42 Greenland glacier 42 Tibetan Plateau 42 coastal dune 42 lateritic 41 shallow continental shelf 41 biosphere 41 submersed 41 embayment 41 oxygen depletion 41 Bayou Terrebonne 41 saltwater intrusion 41 Arctic permafrost 41 stopbanks 41 hydrological cycle 41 Lake Nyos 41 peat swamps 41 decaying vegetation 41 unplanned urbanization 41 shallower 41 andesitic 41 ecological 41 Ogallala aquifer 41 lowland flooding 41 subducted 41 desertification 41 floods cyclones 41 species extinctions 40 periodic droughts 40 extensional 40 soil salinity 40 hydrogeological 40 methane hydrate 40 Mau forest 40 mountain snowpacks 40 coastal ecosystems 40 breakwalls