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Peak Phosphorus

Most of the phosphorus which we use for fertilizers comes from rock phosphate. Rock phosphate is mined in only a few places around the world, Florida being one. Just as it is a foregone conclusion that we will run out of oil someday, it is also a foregone, but lesser known, conclusion that we will run out of rock phosphate. Estimates are that we will reach "Peak Phosphorus" (in other words maximum phosphorus production.) in 20 years or so and that we will run out in 50 - 100 years. Here's an interesting article on the situation