Nearly a third of the world's population suffers from hunger or malnutrition. Feeding them - and the projected population of 10 billion people by 2050 - has become a high-profile challenge for states, philanthropists, and even the Fortune 500. This has unleashed a steady march of initiatives to double food production within a generation. But will doing so tax the resources of our planet beyond its capacity? In this sobering essay, scholar-practitioner...