We have some berry bushes and a few fruit trees in our back yard. Every spring I plant a few vegetables in a couple of small patches (some years they produce; other years they just wither under the care of my brown thumb). It’s nice to be able to go out back and pick a cucumber or a handful of raspberries, but it doesn’t sustain us. If we had to feed ourselves on what we can produce, we’d be dead in a matter of weeks.

The same is true for most of us in the industrialized world. In the modern west, only about 3% of the population is engaged in primary food production, which is to say: actually producing edible things from nature. Farmers, ranchers, and fishermen (along with some more niche specialists like bee-keepers and salt miners) are in a very small minority today. That 3% manages to feed all the rest of us, but only because of a host of modern technologies: mechanized farming, chemical fertilizers and pesticides, antibiotics, refrigeration and canning, cheap long-distance transport, and so on. Pre-modern societies had to feed themselves with none of these advantages, which means that food production required a huge amount of labor.

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