The historian Annette Kehnel researches the history of sustainability. In an interview with Eckart von Hirschhausen, she talks about the resource-saving handling of food in the Middle Ages and why we should put cookbooks on the shelves more often. Eckhart von Hirschhausen

Today we like to think that sustainability is a totally modern idea. You are a professor of medieval history. How old is sustainability really? Much of what we can do today, we were able to do before. My question is: When did we actually forget that? When did we forget how long-term economics works: recycling, sharing economy, public welfare economy, microcredit. Much of what is discussed today under the term sustainability was completely self-evident for centuries and millennia.