In 2021 NATO addressed climate change individually for the first time in official public discourse at its highest level. Although climate change is addressed at the unit level, at the sub-systemic level official, formalized engagement with climate change by security actors is recent. The transnational issue of climate change requires a prioritized, collective response which makes securitization appealing, however there is caution concerning securitization to avoid a state-centric response that militarizes engagement with the issue and excludes other alternatives. NATO as the largest military alliance, a collective representation of the West and Annex I and II parties to the UNFCCC plays a significant role in this regard. The thesis’ purpose is to provide an exploratory starting point into NATO’s official engagement with climate change and security by using securitization theory to inform discourse analysis examining discourses stemming from the NAC and Secretary General. The analysis finds that NATO addresses climate change as a threat-magnifier instead of a threat, avoiding securitization but approaching the issue from a pre-dominantly military logic of threat nonetheless. The securitization framework additionally facilitates discussion of a possible future direction of Western security politics by discussing three future factors of climate change and security.