The evidence is convergent. Multiple independent sources reach the same conclusion, the underlying mechanism is well-characterized, and even the field's most cautious voices treat it as worth doing.
So in 1940, the average, the average density of human sperm was 113 million per milliliter of semen. That's how it's measured. How many sperm per milliliter of semen. In 1990 this figure has dropped to 66. So it went from 113 million per milliliter to 66 million per milliliter in the United States and Western Europe.
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Researchers also estimated that the volume of semen produced by men has dropped 20% in that time, reduced sperm count per generation even further.
across the globe men's healthy sperm counts have dropped 50 in the last 40 years
statistic for you healthy sperm counts in men have dropped 50 percent in the last 40 years 50 last 40 years