The researchers found …a 59.3 percent decline in total sperm count, among men from North America, Europe, Australia and New Zealand who were not selected based on their fertility status. These findings strongly suggest a significant decline in male reproductive health that has serious implications beyond fertility and reproduction, given recent evidence linking poor semen quality with higher risk of hospitalization and death.
The causes of the decline have been widely linked to chemical exposure, especially from agricultural chemicals like atrazine that are “chemical castrators” of men. These chemicals cause “feminization” of males, leading to hormonal disruption and sperm population decline. That decline, researchers found, is accelerating in western nations like the United States and could lead to a collapse in human population.
https://www.sciencedaily.com/releases/2017/07/170726110954.htm