This paper aims at contributing to this branch of research by providing first attempts for a theoretical discussion of the role of environmental cooperation in post-conflict peacebuilding, followed by an illustration of two concrete peacebuilding cases: Liberia and Mozambique. The major underlying question is how a closer link between research on environmental peacemaking and post-conflict peacebuilding can be achieved. The paper argues that both branches of research have historically been rather detached from one another. Work on the link between environmental aspects and security has often been dominated by environmentalists, e.g. water engineers or conservationists, while research on post-conflict peacebuilding has often been done by those specialized in the fields of international relations or conflict resolution. A systematic study of potential spill-over effects between research and environmental peacemaking and other branches of research might therefore reveal interesting findings about the potential role of environmental peacemaking in the context of post-conflict countries. Chapter 2 provides a start into this discussion by reviewing some of the core literature on the link between natural resources and violent conflicts, the theoretical background of the environmental peacemaking theory, and some of the literature on post-conflict peacebuilding. Chapter 3 uses the insights gained from this theoretical discussion in order to systematically look for interconnections and spill-over effects. As a result of this discussion, concrete hypotheses about the role of environmental peacemaking in post-conflict countries will be derived. Chapters 4 and 5 contain a discussion of the peacebuilding challenges in Mozambique and Liberia, followed by an analysis of the potential role for environmental peacemaking to support their peacebuilding processes. Chapter 6 contains the conclusions of this discussion, followed by a range of concrete policy recommendations, addressed primarily to the international community.