Related by context. Frequent words. (Click for all words.) 56 Soil erosion 54 toxic algae blooms 52 Algae blooms 51 overfishing pollution 49 deplete oxygen 48 marine 48 sediment runoff 48 Toxic chemicals 48 contaminating groundwater 48 seagrasses 47 aquatic organisms 47 Melting glaciers 47 Nitrogen oxides 47 corrosives 47 Sea otters 47 Invasive plants 47 rampant deforestation 47 rotting vegetation 47 seabeds 47 microscopic algae 47 gastropods 47 Tidal waves 46 industrial effluents 46 nonnative fish 46 freshwater mussels 46 inter tidal 46 toxic chemicals 46 longline fishing 46 coral reefs 46 intermittent streams 46 Methyl bromide 46 Earth ozone layer 46 overexploitation 46 rivers lakes 46 Burning fossil fuels 46 aquatic ecosystems 46 salination 45 aquatic invertebrates 45 Ocean acidification 45 waterways 45 sealife 45 pollutions 45 tailing ponds 45 fishing fleets 45 algal bloom 45 oxygen depletion 45 polluted waterways 45 pollution 45 indiscriminate dumping 45 carcinogenic chemicals 45 Shrimping 45 trawl nets 45 toxic substances 45 polluting 45 sea lampreys 45 freshwater lakes 45 aquatic species 45 toxic algae bloom 45 Diesel exhaust 45 pollutants 45 microscopic organisms 44 acidification 44 toxic pollutants 44 algal blooms 44 algae blooms 44 Giant squid 44 rubbish dumps 44 toxic waste 44 overharvest 44 plankton 44 boat hulls 44 turtle nests 44 acidifying 44 PCBs polychlorinated biphenyls 44 garbage heaps 44 toxic algae 44 toxic pollutant 44 plankton blooms 44 marine organisms 44 False alarms 44 harmful algal blooms 44 contaminating 44 Invasive species 44 polluted 44 Whale sharks 44 suspected carcinogen 44 clathrates 44 Sulfur dioxide 44 sediment 44 biota 43 seabirds 43 retreating glaciers 43 coastal waters 43 poisonous chemicals 43 animal droppings 43 ecological disasters 43 Cigarette butts 43 Coral reefs 43 noxious chemicals 43 mussel species 43 acid rain