While sperm counts are dropping, fertility, culprits, genotoxic effects, health and medicine.
As the use of toxic chemicals, synthetic hormones, and such increases, so does evidence that our polluted environment i's damaging the ability of humans to reproduce.
The effect seems clear: The average sperm count of American males is dropping. Studies have indicated that the proportion of men who have 100 million sperm per milliliter (ml) of semen has dropped from 80% in 1929 ... to 44% in 1950 ... all the way down to 22% in 1977! But what is the cause of this problem? Well, for a while, much of the popular news media offered lighthearted speculation that the lowered sperm counts might be related to a society-wide increase in sexual activity (which supposedly left males with depleted reserves) or to widespread use of tight-fitting underwear (which may, indeed, subject heat-sensitive sperm to injurious temperatures by holding them unnaturally close to the body).
Full story: http://www.motherearthnews.com/Nature-Community/1983-09-01/The-Sperm-Crisis.aspx
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