Since the first studies by Ole Waever and the Copenhagen School, securitization theories have been criticized, revised and completed. Based on a specific empirical case study, this paper intends to do the same. Focused on the original case of environmental securitization within the United Nations (UN), this article aims to address the often-eluded question of the role of International Organizations in the securitization process. This example helps us to rethink securitization as well as politicization as discussed by securitization scholars and in environmental security studies. Contrary to the original definition of the Copenhagen School of depoliticization – understood as dedemocratisation –, this article argues that if, indeed, securitization can lead to depoliticization, the way we think depoliticization has to be revised. It can be an intentional strategic move by international securitizing actors to frame environment as an apolitical issue that requires a non-politicized scientific approach. Therefore, UN activities could reveal an attempt of a securitization without politicization, but not understood as a dedemocratisation.