There are two macro population health trends that suggest we are somehow poisoning ourselves at a large scale. Most people do not relate the two, but I personally wouldn't be surprised if they have related causes. The first is the Flynn effect, which was rising IQ levels decade over decade, which halted and then reserved for most Western nations around 1990s/2000s and is now declining: https://en.wikipedia.org/wiki/F…
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Yes this is true. With all the C-section babies we have now, if we ever loss access to low cost surgical delivery care, we are going to have a spike in childbirth related deaths. But the male infertility crisis is rising faster than evolution can adapt here. There is something external involved.