Chapter 2 maps out major theories in peace and conflict studies dealing with the interaction between nature, war, and peace. While acknowledging that the field is characterised by a broad diversity of research traditions and methodological approaches, the aim of the chapter is to offer a review of the research that has had most influence on international policies and legal development. Although legal scholars often think of this literature as monolithic, what will emerge from this chapter is that there is a vivid debate on the linkages between environment and conflict, which is explained by the different underlying paradigms and concepts. It is important to pay attention to the contested nature of these analytical frameworks to better understand (and challenge) the approaches that emerged at the international level. The second part of the chapter introduces environmental justice as an alternative framework to move beyond certain problematic assumptions about environmental scarcity/abundance that have fed into international law. Environmental justice perspectives will be used in subsequent chapters to think about justice accordingly and beyond international law.