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Wouldn't it make sense to consider this being environmental? estrogen-mimicking plastics? phthalates?
Interesting hypothesis
The changes would be gradual over decades if that were the main reason
Right, that's my point, it's gradual over decades. OPs data shows sex increasing from about 2008 to 2014, then falling off a cliff after 2014, implying this is not the main cause.
2018 is pre covid.Probably looks worse since 2020.
Wouldn't it make sense to consider this being environmental? estrogen-mimicking plastics? phthalates?