When I was a kid, hunger was one of the main problems of poverty in America. Today, it's obesity. Something dramatic has changed in the world of agriculture in the past four decades— we got much better at growing food. A technology-driven revolution turned a scarce commodity into an abundant one. And in that story lie clues to what can happen when any major resource shifts from scarcity to abundance.
There are only five major inputs to a crop: sun, air, water, land (nutrients), and labor. Sun and air are free, and if the crop is grown in an area with plenty of rainfall, water can be free, too. The remaining inputs—primarily labor, land, and fertilizer—are very much not free, and they account for most of the price of crops.
In the nineteenth century, the Industrial Revolution mechanized agriculture, radically lowering the cost of labor and increasing crop yield. But it was the "Green Revolution" of the 1960s that really transformed the economics of food by making farming so efficient that fewer people had to do it anymore. The secret of this second revolution was chemistry.
For most of human history manure has determined how much food we had. Agricultural yield was limited by the availability of fertilizer, and that largely came from animal (and sometimes human) waste. If a farm wanted to support both animals and crops in a synergistic nutrient cycle, it had to split its land
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It turns out 'free' is not a new idea: think radio and television in the days of antennas. M