Related by context. Frequent words. (Click for all words.) 68 Soil erosion 64 salination 64 groundwater depletion 64 soil salinity 61 soil erosion 59 rampant deforestation 58 ecological degradation 57 denudation 57 species extinctions 57 nutrient runoff 57 prolonged droughts 57 recharge groundwater 57 periodic droughts 56 Melting glaciers 55 severe droughts 55 environmental degradation 54 deforestation 54 streambanks 54 thawing permafrost 54 saturated soils 53 floods droughts 53 habitat fragmentation 53 overexploitation 53 Amazon deforestation 53 floods cyclones 52 frequent droughts 52 pasture grasses 52 habitat degradation 52 beetle infestations 52 decaying vegetation 52 overfishing pollution 52 Rapid urbanization 51 woody vegetation 51 potent greenhouse gas 51 desertification 51 riparian zones 51 rainforest destruction 50 cypress forests 50 worsening droughts 50 overgrazing 50 scarcities 50 shoreline erosion 50 Warming temperatures 50 winterkill 50 insect infestations 50 overharvest 50 sparse vegetation 50 drylands 50 polluted runoff 50 Illegal logging 50 locust infestation 50 river deltas 50 erratic monsoon 49 erosion 49 glaciers melt 49 aspen stands 49 deplete oxygen 49 melting snowpack 49 malaria cholera 49 pest infestations 49 prolonged drought 49 Severe drought 49 driest inhabited continent 49 nitrogen deposition 49 peat swamps 49 cropland 49 phytoplankton blooms 49 rapid urbanization 49 crop yields 49 saltwater intrusion 49 shelterbelts 49 toxic algae blooms 49 sediment runoff 49 polluting waterways 49 melting icecaps 49 herbicide resistant weeds 49 deforesting 49 plankton blooms 49 riparian vegetation 48 gully erosion 48 lowland flooding 48 seagrasses 48 rapid snowmelt 48 acidify 48 Everglades ecosystem 48 upwellings 48 unusually heavy rains 48 soil fertility 48 retreating glaciers 48 nesting habitats 48 leafless charred trunks 48 vegetation 48 mold fungi 48 wetland ecosystems 48 deforest 48 Fertilizing 48 lakeshores 48 croplands 48 Algae blooms 48 drier summers 48 bioenergy crops