However, it bears its roots to the Brundtland Report of 1987. The period following the Rio Summit led to the institutionalization of a variety of frameworks for environmental sustainability, also considered a millennium development goal at global, regional and national levels. From 1992 to 2009 a series of regional agreements were developed, including; the Abidjan Convention, the Yaounde Declaration, The Comifac treaty, Treaty of economic community of West African States (ECOWAS), ECOWAS Environmental Policy and the Charter and Action Plan on Sustainable Mangrove Management have emerged at the regional level.