Since the 1960s, the EC and its former colonies (African, Caribbean, Pacific ACP countries) have organised their economic ties around the Lomé conventions. The focus of this paper is directed at the substance of the ACP-EC cooperation on the environment within the framework of the Lomé IV Convention. The paper also examines the nature of the ecological crisis facing African ACP countries. The author notes that the ecological crisis in African ACP countries has been complicated by the energy crisis. The thrust of this analysis is directed at the response of Lomé IV to the ecological crisis in ACP countries. To this end, the author examines the relevant provisions of the Convention. The author concludes that despite its shortcomings, Lomé IV constitutes an important document of transnational environmental law.