“The world should just switch to a vegetarian/vegan diet.” — says seemingly everyone, regarding the food-sustainability problem. If someone offers a solution to the Gordian Knot of food sustainability, run it through the following gauntlet:Does it allow you to do most of your food shopping at the grocery store? Does it require just eliminating one or two things from your diet or, alternatively, eliminating all but a few things? Does it excuse you from making substantial shifts in your diet as the seasons progress? A ‘yes’ to any of those questions is the clarion call of bulls . A long list of solutions gets beaten to death in this gauntlet, and few so much as vegetarianism.