This textbook introduces advanced students of International Relations (and beyond) to the ways in which the advent of, and reflections on, the Anthropocene impact on the study of global politics and the disciplinary foundations of IR. The book contains 24 chapters, authored by senior academics as well as early career scholars, and is divided into four parts, detailing, respectively, why the Anthropocene is of importance to IR, challenges to traditional approaches to security, the question of governance and agency in the Anthropocene, and new methods and approaches, going beyond the human/nature divide. Chapter 9, “Security in the Anthropocene” is available open access under a Creative Commons Attribution 4.0 International License via link.springer.com.