The impacts of climate change are increasingly felt worldwide, affecting every country regardless of geographical location. Over the past 50 years, numerous treaties have been produced that are aimed at combatting climate change. However, these international efforts have often been hindered by the actions of great powers prioritising their own interests over global solutions. Since security is one of the most determining factors in states’ decision-making, Security in International Climate Policy analyses the relationship between states’ security policies and their efforts against climate change. The book hypothesises that security policies negatively affect measures against climate change. While the security policies of great powers pose a hurdle for a successful climate policy in the first stages of efforts, there is a shift in the 21st century, when climate change itself begins to threaten the security of states. Based on these findings, the author predicts future policy trends and makes policy recommendations.