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A comment on Sperm counts are declining. Scientists have pinpointed the main causes.
This study lists the likely suspects (scroll down for the table), but is not quantitative enough to show which have the highest impact.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7807371/
My guess: it's lead from gasoline- we've contaminated all top-soil with it. The effects are going to be around for a long time.
[1] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1797860/
This study lists the likely suspects (scroll down for the table), but is not quantitative enough to show which have the highest impact.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7807371/
My guess: it's lead from gasoline- we've contaminated all top-soil with it. The effects are going to be around for a long time.