[alexandercrohde]

There are actually well over 100 studies on this from different regions and periods. Google scholar can help.

[alexandercrohde]

Why is this downvoted? Simply putting in "sperm count decline" into google scholar gives over 42,000 papers.

Lay people need to understand that this is not just some off-the-cuff casual theory, but a very-well-researched 30-year-trend.