This discussion forum brings together some of the leading voices in the debate on climate change and security to reflect on the possibilities and limits of critical research in the face of global ecological crises. If we – as critical geography, IR, and security scholars – take the ongoing ecological crisis seriously, how must our questions, concepts, and methodologies change? How, if at all, can security be provided in a climate-changed world, for and by whom? How to come to terms with the unequal landscape of climate insecurity? What is left of security, and what comes instead: mere survival, resilience, or navigating through disasters?Seeking answers to these questions, the authors of these short forum pieces discuss and rethink core concepts and themes of human geography and neighboring disciplines. The reflection pieces trouble the racist imaginaries that often underpin existing policy debates on climate change, scarcity, and insecurity. They discuss the implications of climate security for the liberal international order, North-South relations as well as the relationship between humans and the non-human world. They reflect on the complicity of our research – both critical and problem-solving – in the violent transformation of the planet and the repression of the racialized “others” of colonial modernity. And they explore the emancipatory potential of alternative security discourses that center on the complex web of beings, practices, and relations endangered by the unfolding climate crisis.