This book stems from a rigorous observation: the effects of climate change no longer fall solely within the environmental sphere. They are profoundly reshaping the nature of conflicts, acting as structural factors of strategic destabilisation. Dominique Bourg and Jean-Vincent Holeindre reveal a silent but decisive transformation: alongside conflicts over access to resources, wars are emerging from the very dynamics of climate change. Droughts, collapsing agricultural production, population displacement and infrastructure vulnerability are becoming central issues in global geopolitical reconfiguration. The interest of this dialogue lies in the confrontation between two rationalities: the critical and ethical one of ecological thinking structured around planetary limits; and the strategic one of realism nourished by the long history of conflict. Together, they construct a typology of new forms of warfare—asymmetric, hybrid, climate-related—and question the relevance of old categories such as deterrence and sovereignty in a world where the threat may be drought, runaway global warming, or territorial disintegration. Patrick FRÉMEAUX and Claude COLOMBINI Dominique Bourg, Franco-Swiss philosopher, specialist in political ecology, honorary professor at the University of Lausanne. He has established himself as one of the leading thinkers on the Anthropocene, articulating criticism of progress, ecological transition and democratic renewal. Author of essays and director of collections at PUF and Frémeaux PUF, he advocates for a politics of the common good on a global scale. Jean-Vincent Holeindre, political scientist and professor at Paris-Panthéon-Assas University, specialist in strategic thinking and international relations. He was scientific director of the Strategic Research Institute of the Military School (IRSEM). His research focuses on just war, terrorism and changes in conflict, combining political philosophy, strategic studies and the ethics of international relations.