Whilst an urban food policy that aims to achieve self-sufficiency sounds like an admirable goal for a city, a recent reportreviewing existing studies highlights that the topic isn’t as straighforward as it first appears. Yes self-sufficiency of food production can reduce greenhuse emissions and have other economic and social benefits, but it can also increase emissions due to high energy consuption required for sometimes low yields. Decreasing the environmental footprint of the food system is a crucial goal so it’s worth remembering that self-sufficiency alone isn’t the only way to achieve this.