If empirical evidence shows that environmental security is on the United Nations agenda, very few studies try to understand the agenda-setting process of this issue. My thesis research intends to fill this gap by analyzing the process of environmental securitization within this organization. Securitization theories and critical security studies propose an initial set of useful theoretical tools. Nonetheless, this paper argues that they are not the only ones, and that Political Ecology could provide another interesting perspective as well as encourage an interdisciplinary dialogue. By promoting transdisciplinarity, highlighting the social and economic dimensions of environmental conflicts, and calling attention to the power and knowledge structures at the foundation of the securitization process, Political Ecology proposes highly relevant additions to the study of environmental securitization within the United Nations. This paper argues that this particular example shows the benefits of collaboration between political ecologists and Securitization theorists – and, more generally speaking, international relations scholars – and therefore advocates for more mutual and constructive dialogue among these different schools of thought.