Jensen co-wrote the book "Deep Green Resistance: Strategy to Save the Planet" with Lierre Keith and Aric McBay. Jensen's contribution consists of end-of-chapter responses to common queries he gets about bringing down civilization. The bulk of the book is by the other two authors and covers the history of effective militant resistance movements such as parts of the U.S. civil rights movement and the Movement for the Emancipation of the Niger Delta (MEND), while also outlining potential strategies for above- and below-ground resistance to civilization, termed Decisive Ecological Warfare. After the book's publication, the authors co-founded an organization by the same name. McBay left the organization in 2012, attributing his departure to the alleged cancellation of a transgender-inclusive policy by Jensen and Keith. Deep Green Resistance has disputed this account, saying that the decision to restrict women's spaces was made by the women of DGR, not Jensen or Keith.