A Global Fertility Crisis - Dr. Shanna Swan
(www.youtube.com)
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The Carlson study of 1992 (link below) provided foundational evidence for the decline in mens sperm count that continues to this day. Later studies like to imply individual habits such as smoking but there are other theories suggesting chemicals in plastic water bottles when subjected to long term storage a heat, release a chemical that impacts perm count.
A book by Dr Leonard Sax called “Boys Adrift” describes these circumstances in great detail. Many say the decline is intentionally induced.
https://pubmed.ncbi.nlm.nih.gov/1393072/