The Sperm-Count ‘Crisis’ Doesn’t Add Up - The New York Times

In a study published in May in the journal Human Fertility, they re-evaluated the 2017 review and found that it relied on flawed assumptions and failed to consider alternate explanations for the apparent decline of sperm. 

In an interview, Sarah Richardson, a Harvard scholar on gender and science and the senior author on the new study, called the conclusion of the 2017 review "an astonishing and terrifying claim that, were it to be true, would justify the apocalyptic tenor of some of the writing." Fortunately, she and her co-authors argue, there is little evidence that this is the case...

https://www.nytimes.com/2021/06/04/health/sperm-fertility-reproduction-crisis.html