Related by context. Frequent words. (Click for all words.) 66 overfishing pollution 63 habitat degradation 61 Soil erosion 61 overhunting 60 habitat fragmentation 60 overharvesting 59 environmental degradation 58 overexploitation 57 Everglades ecosystem 57 rampant deforestation 55 soil salinity 55 overharvest 55 salination 54 harmful algae blooms 54 toxic algae blooms 54 overfishing 54 coastal ecosystems 54 ecological degradation 53 aquatic habitats 53 Sea otters 53 Yellowstone cutthroat trout 53 marbled murrelets 53 species extinctions 52 habitat 52 ecological 52 biodiversity hotspot 52 Overfishing 52 Ocean acidification 52 predation 52 wetland ecosystems 52 murrelet 52 prolonged droughts 52 seagrasses 52 ocean ecosystems 51 amphibian populations 51 ecological disasters 51 fragile ecosystems 51 eelgrass beds 51 habitats 50 endocrine disruption 50 Invasive plants 50 thawing permafrost 50 worsening droughts 50 riparian vegetation 50 aquatic ecosystems 50 red legged frogs 50 ecosystems 50 fragile ecosystem 50 Rapid urbanization 50 severe droughts 50 snowy plovers 49 cypress forests 49 marine ecosystems 49 aquatic invertebrates 49 functionally extinct 49 retreating glaciers 49 freshwater ecosystems 49 plankton blooms 49 insecticide DDT 49 marbled murrelet 49 Suisun Marsh 49 Algae blooms 49 Invasive species 49 wildlife habitats 49 aquatic ecosystem 49 manmade 49 rampant poaching 49 insect borne diseases 49 depletion 49 ecology 49 stratospheric ozone layer 49 biodiversity 49 Illegal logging 48 waterfowl populations 48 terrestrial ecosystems 48 steelhead populations 48 nutrient loading 48 ocean acidity 48 nutrient runoff 48 extirpation 48 bioaccumulation 48 deforestation 48 overgrazing 48 saltwater intrusion 48 Melting glaciers 48 soil erosion 48 coral reef ecosystem 48 fragile ecology 48 mussel species 48 riparian zones 48 beetle infestations 48 coastal erosion 48 tidal wetlands 48 whales seals 48 siltation 48 waterbird 48 sediment runoff 48 Predation 48 rainforest destruction 48 harmful algal blooms 48 periodic droughts