The Anthropocene presents new challenges to the natural and social sciences by claiming that humanity is Bentangled^with a myriad of scales, spaces, being(s), and temporalities. Yet, how does this entanglement alter our understanding of security? This article argues that the Anthropocene threatens not our physical security, but our ontological security: our deep and normalized conceptions of humanity and what it means to be a human Bself^in a stable and continuous world. By replacing the foundation of ontological security in modernity -the uncertainty of death -with a new uncertainty of anthropos, the result is an existential discontinuity emanating from our own human selves. The Anthropocene thus manifests the need to secure humanity from humanity, or the paradox of securing oneself from oneself. Recent turns to the concept of Bquantum entanglement^attempt to resolve this paradox by re-instilling a certain and secure Bentangled^human self within an otherwise uncertain and insecure Anthropocene epoch. The article concludes that this move actually illustrates humanity's separation, or dis-entanglement, from nature. Ethical and moral responsibilities to mediate and safeguard life and the planet derive not from (quantum) science nor from entanglement, but from a social world within which humans possess the agency to mediate and judge how to act through such concepts.We live in a world where the impact of humanity upon the Earth's natural processes and systems is becoming frighteningly evident. Atmospheric concentrations of carbon dioxide (CO 2 ) have recently passed the dreaded 400 parts per million (ppm) threshold, portending runaway anthropogenic climate change in the future [1]. Biodiversity loss, or the vanishing of species at rates more than 100 times faster than without human interference, points to the Earth's sixth mass extinction -the first caused by humans [2]. And with these two core planetary boundaries transgressed, along with others such as land system transformation and biogeochemical cycles of nitrogen and phosphorus Crime Law Soc Change (2017) 68:579-595