This article analyzes the implications of the Anthropocene for the governance of security. Drawing on environmental law, green criminology, and international relations, the article examines the development of environmental security scholarship over recent decades and shows similarities and differences in perspectives across the three disciplines. It demonstrates that the Anthropocene represents a significant challenge for thinking about and responding to security and the environment. It argues a rethinking is needed, and this can benefit from reaching across the disciplinary divide in three key areas that have become a shared focus of attention and debate regarding security in the Anthropocene. These are, first, examining the implications of the Anthropocene for our understanding of the environment and security, second, addressing and resolving contests between environmental securities, and third, developing new governance responses that mix polycentric and state-backed regulation to bring safety and security to the planet.