The January 2023 edition of the IRMO Brief, authored by Marija Pujo Tadić, deals with the Climate Diplomacy. The reality of climate change will require a thorough adjustment in the conduct of international relations and will also change the focus of international security policy. It will change strategic interests, alliances, borders, threats, economic relations, comparative advantages, and the nature of international cooperation. Also, it is certain that climate diplomacy, with all its negotiation and communication techniques, will play a major role in achieving such a high-set goal to alleviate impacts of climate change. The author also analyses the importance of well-prepared foreign policy and diplomacy for timely and adequate involvement in dealing with the geopolitical consequences and security implications of climate change.