This is something meat advocates conveniently forget. With all their talk about “it’s nature” or “it’s just the food chain,” did they not learn about trophic levels and nutrient flow in high school? Specifically the part about one layer of the trophic pyramid requiring at least an order of magnitude more biomass on the layer below? Even if we didn’t care at all about ethics, the efficiency of cutting out an entire trophic level from our food chain speaks for itself. It’s why we don’t raise cows to farm tiger meat.