In a forthcoming report by the Joint Group of Experts on the Scientific Aspects of Marine Environmental Protection (GESAMP), estimates will be made on oil entering the marine environment from sea-based activities. The GESAMP Working Group has co-operated with the U.S. National Academy of Sciences, which published its report in 2002 on oil discharges at sea and into the sea from North America. The GESAMP report will deal with the following sources of oil inputs into the sea:
OIL FROM SHIPS
Ship-related operational discharges Machinery space bilges: Oil tankers
Fuel oil sludge
Oily ballast water from fuel tanks
Air emissions: VOCs
Cargo-related operational discharges Tank washing
Oil in ballast water
Accidental discharges (spills) Accidents (oil spills)
Sunken vessels, merchant or military
Dry docking of ships (See photo) Dry docking of tankers
Dry docking of other vessels
Scrapping of ships  
Deliberate discharges to save life at sea

OIL FROM OFFSHORE EXPLORATION AND PRODUCTION
Operational discharges Machinery space discharges
Drilling discharges
Produced water discharges
Air emissions: VOCs
Accidental discharges (blowouts)
Pipelines Operational discharges
Accidental release (oil spill)

OIL FROM OTHER SOURCES
Coastal refineries, oil storage facilities, marine terminals (Land-based sources) Operational discharges from refineries
Accidental releases from coastal facilities
Reception facilities (Land-based sources)
Oil in waste materials dumped at sea
Fuel dumps from aircraft
Outboard engines (motors) Leisure craft
Natural oil seeps (Natural sources)
Rocket launches
Tar distribution
Accidental discharges from unknown point sources