History of Chad Africa's major language groupings south of the Sahara Desert (except Khoisan, which is not considered a valid genetic grouping anyway), i. e. the Afro-Asiatic, Nilo-Saharan and Niger–Congo phyla, originated in prehistoric times in a narrow band between Lake Chad and the Nile Valley. The origins of Chad's peoples, however, remain unclear. Several of the proven archaeological sites have been only partially studied, and other sites of great potential have yet to be mapped. At the end of the 1st millennium AD, the formation of states began across central Chad in the sahelian zone between the desert and the savanna. For
Chad–Cameroon Petroleum Development and Pipeline Project NGO founded and run by native lawyer Samuel Nguiffo. The CED's main purpose is to advocate and campaign against the "liquidation of the regions forests for short-term profit". Certain exploitations within the Cameroon region include logging, hunting for bushmeat, mining for natural resources and the construction of the Chad-Cameroon pipeline. The CED works to inform local communities about their rights to land and community forest concessions, as well as constant documentation and publications to educate the international community. Catholic Relief Services, an international nonprofit humanitarian organization, has been one of the key watchdogs in the pipeline project, even before construction