The Socioeconomic Data and Application Center (SEDAC) Treaty Status Dataset contains comprehensive treaty information for multilateral environmental agreements, countries and organizations. The original data were obtained from the International Union for the Conservation of Nature and Natural Resources (IUCN) Environmental Law Center. SEDAC reorganized the data and added new variables computed from the original variables to include the year of agreement, year of entry into force, length of time to enter into force, number of signatories, parties, and former parties (if applicable), in addition to year of signature, ratification, accession or adherence, acceptance or approval, succession and denunciation. This dataset is produced in collaboration with IUCN and the Columbia University Center for International Earth Science Information Network (CIESIN).