The International Maritime Organization states, "The MARPOL Convention is the main international convention covering prevention of pollution of the marine environment by ships from operational or accidental causes. It is a combination of two treaties adopted in 1973 and 1978 respectively and updated by amendments through the years." The 1973 MARPOL Convention was signed on November 3, 1973. The 1978 Protocol asorbed the 1973 Convention, which had not yet entered into force. The combined convention, now known as MARPOL, entered into force on October 2, 1983. The link below provides access to the original texts and all amendments.