Figuring out the cause of this seems a high priority.https://twitter.com/XiXiDu/status/1121423320552038400 …
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Almost certainly plastics.
What's the most powerful evidence for this being the main driver? Sperm count/testosterone down in the USA after controlling for age and weight.
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No strong evidence, but https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3222987/ … Other possibilities include sunscreen, general sun avoidance, and kids not spending as much time outside, where they got tons of exercise.
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