The rules of international law find their authority in the provisions of Article 38 (1°) of the Statutes of the International Court of Justice, in four sources, namely: treaties, international custom, general principles of law, and secondary sources (court decisions, tribunals and doctrine). However, beyond these sources of "hard law", which impose binding obligations, there are also "soft law" rules whose obligations are not binding. However, it should be noted that new customary rules appear quite quickly, as does the speed with which global environmental issues take hold of the political calendar, tending to highlight the evolution of legal norms and to relegate customary law to the background, after conventions or treaties. Although some fundamental principles, such as the equitable use of resources can be attributed to decisions based on customary law, treaties are undoubtedly the main basis used by the international community to regulate activities threatening the environment. In this perspective, the legal framework for waste management in Cameroon by international environmental law is palpable through the ratification of treaties, international agreements because Cameroon is a signatory of conventions, codes, protocols, and international agreements which reinforce the existing legal instruments at the national level and especially which lend credibility to the environmental protection policy in general, and the efficient and environmentally sound management of waste in particular, with international partners.