It is also clear that sperm counts have declined very significantly in the past decades. Some estimates put it at nearly 60% in Western men. But similar reports

It is also clear that sperm counts have declined very significantly in the past decades. Some estimates put it at nearly 60% in Western men. But similar reports can be found for China https://www.nature.com/articles/s41598-020-67707-x.pdf https://www.nature.com/articles/s41598-020-67707-x.pdf and Africa. http://www.bioline.org.br/pdf?hs17052 http://www.bioline.org.br/pdf?hs17052