This Info Flash analyses the environmental concerns that have climbed to the top of the international agenda. The armed forces and the defence sector as a whole are not exempt from this trend. Moreover, the defence sector’s environmental footprint is massive, making it necessary for the armed services to devise new policies and activities targeted at minimizing this footprint. These changes represent both a threat to military institutions and an opportunity to implement new technologies that can improve operational and military capabilities (Duncan, 2023). Understanding the effects of climate change, thus, is critical for gaining a knowledge advantage. The military has to understand how climate change and shifting climatic conditions affect strategy and operational conduct. Extreme weather events, for example, may have an impact not only on the operability of military capabilities but also on their efficiency and military installations as a whole. In the future, we are also expected to witness more conflicts caused by climate change, for which security agencies will need to prepare (Wigell & Hakala, 2022).