Agriculture is only a renewable resource when it is done sustainably. What we do in large parts of the world is, essentially, strip-mining our topsoil (And, in

Agriculture is only a renewable resource when it is done sustainably. What we do in large parts of the world is, essentially, strip-mining our topsoil (And, in the United States, aquifers) to grow food. We consume it faster than we can replenish it. This works great for juicing the numbers in the short-term, but is going to be a bit of a pickle later on. Whale oil was also a renewable resource...