The International Convention for the Prevention of Pollution from Ships (MARPOL) is the main international convention covering prevention of pollution of the marine environment by ships from operational or accidental causes. See :
MARPOL: Historic Background and
The question of marine pollution was discussed at the United Nations Conference on the Human Environment (Stockholm, 1972).
Final Act of the International Conference on Marine Pollution, 1973 (MARPOL, 1973) and Convention
Travaux préparatoires of the 1973 Conference