Related by context. Frequent words. (Click for all words.) 61 salination 60 Soil erosion 59 resource depletion 58 salinization 57 freshwater habitats 57 floods cyclones 57 groundwater depletion 57 prolonged droughts 56 freshwaters 56 deltaic 55 floods droughts 55 Melting glaciers 55 earthquakes volcanic eruptions 55 soil salinity 55 river deltas 55 melting icecaps 55 habitat fragmentation 55 periodic droughts 54 tsunamis earthquakes 54 river catchments 54 combating desertification 54 overfishing pollution 54 climatic extremes 53 environmental degradation 53 delicate ecosystems 53 Coral bleaching 53 coastal inundation 53 unplanned urbanization 53 gully erosion 52 lakeshores 52 desertification 52 receding glaciers 52 ecological degradation 52 disappearing glaciers 52 peat lands 52 frequent droughts 52 worsening droughts 52 ozone layer depletion 52 habitat degradation 52 businesses expanding Norl 52 Coral reef 52 peat swamps 52 earthquakes volcanoes 52 thawing permafrost 51 rampant deforestation 51 toxic algal blooms 51 freshwater 51 icecaps 51 transboundary 51 trans boundary 51 Transboundary 51 Mauritania Niger 51 Spider mites 51 malaria cholera 51 severe droughts 51 species extinctions 51 drier summers 51 ocean basins 51 fertile soils 51 insects reptiles 50 wetland ecosystems 50 recharge groundwater 50 Sedimentation 50 upwellings 50 Whales dolphins 50 soil erosion 50 droughts floods 50 cypress forest 50 Acidification 50 driest inhabited continent 50 siltation 50 embayments 50 polar bears whales 50 Bottom trawling 50 wetter winters 50 salinity 49 rocky reefs 49 arid regions 49 semi arid regions 49 bd.className + = 49 Nominal GDP includes 49 deforested mountains 49 saline soils 49 aquacultural 49 manmade 49 nitrogen deposition 49 plantlife 49 Armyworms 49 frogs salamanders 49 smog acid 49 Seafloor 49 aquatic habitats 49 freshwater ecosystems 48 overexploitation 48 shrublands 48 Antarctic krill 48 seawater intrusion 48 streambanks 48 tributary rivers 48 pristine coral reefs 48 permafrost thaws