By ASRASR (Own work) [CC BY-SA 4.0], via Wikimedia Commons
A good way to scare yourself is by googling “phosphorus shortage”. Agriculture requires lots of phosphorus for fertilizer, and after it's spread on crops, most of it gets washed into the ocean, where it is irrecoverable. Without phosphorus, food production will plummet, unless people come up with new ways to grow food.
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