The Anthropocene is the name for a geological “human age” during which people have reshaped the nature of the planet. Who is involved in these changes? When did they begin? The objects below were selected by students in Prof. Elizabeth Hennessy’s World Environmental History of the Anthropocene course at the University of Wisconsin-Madison in Spring 2019 and Spring 2016 to illustrate the diversity of human practices and technologies that have shaped the nature of the Anthropocene. Essays about each object–from a prehistoric axe to the Mars Rover–explain how understanding their histories can help us understand changing human relationships with the world we inhabit.