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Just fyi: about 50% of crops use synthetic fertilizer. Animal waste is not a requirement. This article discusses the chemical discoveries that lead to the ability to synthesize fertilizer: https://ourworldindata.org/how-many-people-does-synthetic-fertilizer-feed
Spoiler alert: it doesn’t come from dinosaurs**
tl;dr - Haber-Bosch process
You might want to look into how much obtainable phosphorous is left because it’s running low. We might not have other options
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