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Britain's population exploded during the Industrial Revolution. To sustain that growth, they needed a lot of food and, therefore, a lot of fertilizer. Their ports were clogged with boatloads of imported poop and bones from all over the world, until they discovered a rock that was the best fertilizer of all. Ever since, our entire global food system has precariously teetered on access to a precious fossil resource: phosphorus.
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Sources: https://docs.google.com/document/d/e/2PACX-1vQqL08Uz4JeqijkA6yKjVaSFzfTfgRu0MYY7b_bHPQz_OXN99NjOGVn0Ssk3L3I-i8VALNGcIYeqems/pub