Related by context. Frequent words. (Click for all words.) 53 oceangoing ships 50 cargo ships 49 Carbon dioxide emissions 48 container ships 48 LNG tankers 46 Greenhouse gases 46 ballast water 46 shipping 46 oceangoing vessels 46 freighters 45 Aleutian chain 45 Toxic chemicals 45 invasive mussels 45 Seaports 45 greenhouse gases GHGs 45 sewage discharges 44 viral hemorrhagic septicemia 44 containerized cargo 44 invasive species 44 coastal waters 44 inland waters 44 Zebra mussels 44 navigable waterways 43 pollutant 43 ships 43 cargo 43 cargoes 43 Somali pirates seize 43 shipping lanes 43 pollution 43 Sperm whales 43 pollutants emitted 43 Invasive species 43 ports 43 waterways 43 Liquefied natural 43 Sulfur dioxide 42 freight 42 cruise ships 42 shippers 42 Jebel Ali port 42 toxic pollutants 42 recreational boating 42 hazardous wastes 42 toxic algae blooms 42 Passamaquoddy Bay 42 diesel particulate matter 42 Pollutants 42 recreational boaters 42 inland 42 transshipment 42 pollutants 42 nearshore waters 42 sulfur oxide 42 liquified natural gas 42 navigable waters 42 single hull tankers 42 burning fossil fuels 42 hazardous substances 42 container shipping 41 waterway 41 liquefied natural gas 41 inland waterway 41 toxic substances 41 Ukrainian pipelines 41 Ocean acidification 41 vessels 41 polluting 41 seaway 41 Particulate matter 41 inland waterways 41 toxic algae bloom 41 pirate infested 41 toxic waste 41 SO2 emissions 41 sulfur fuels 41 freshwater lakes 41 river deltas 41 Vibrio 41 nutrient runoff 41 nutrient loading 41 boating fatalities 41 pollutions 41 harmful algal blooms 41 fine particulates 41 supertankers 41 Bohai Sea 41 polybrominated diphenyl ethers 41 Admiralty Inlet 41 wastewater discharges 41 shipowners 41 Suisun Marsh 41 Fossil fuels 41 greenhouse gas emitters 41 seaport 41 Aframax tankers 40 longline fishing 40 containerships 40 Paragon Shipping Inc. 40 cruise liners 40 toxic algae