This short book sets out to explore the concept of nature in the context of a changing reality, in which the extent of our transformation of the environment has become evident: What is nature and to what extent has humanity transformed it? How do nature and society relate to one another? What does the idea of a sustainable society entail and how can nature be understood as a political subject? What is the Anthropocene and how does it affect nature as both an idea and a material entity? Has nature perhaps "ended?" In addressing these questions, the author delivers a concise but meaningful study of contemporary understandings of nature, one that goes beyond the limits posed by a single discipline. Adopting a truly comprehensive perspective, the work incorporates classical disciplines such as philosophy, evolutionary theory and the history of ideas; new and mixed approaches ranging from environmental sociology to neurobiology and ecological economics and the emerging area of the environmental humanities and represents a growing branch of political thought that views nature as a new political subject.