Annette Kehnel, The Green Ages: Medieval Innovations in Sustainability. Trans. from the German by Gesche Ipsen. Waltham, MA: Brandeis University Press, 2024, 342 pp., 45 b/w ill.

While I am writing this review, Annette Kehnel is about to publish a new book (Sept. 2024, Die sieben Todsünden: Menschheitswissen für das Zeitalter der Krise) in which she appears to pick up the notion of the Seven Deadly Sins as a fundamental teaching for humankind today facing a global crisis. Those seven vices are, indeed, universal shortcomings in human life, and Kehnel suggests, as I have already done in the past (Wisdom from the European Middle Ages, 2022; or see my blog, “Seven Deadly Sins in Politics, no less and no more,” Elephant Journal, online at: