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DropsTheMic t1_j04h0uy wrote

You mean like: "A study published in the journal Human Reproduction Update, based on 153 estimates from men who were probably unaware of their fertility, suggests that the average sperm concentration fell from an estimated 101.2m per ml to 49.0m per ml between 1973 and 2018 – a drop of 51.6%."

Exact cause unknown though it's believed to be tied to microplastics in the food chain.

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