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popsci.com/science/article/2012-12/sperm-count-has-fallen-one-third-france-biggest-ever-study-suggests
But also:A biggest-of-its-kind study suggests that sperm counts are falling. By a lot. Researchers studied French men from 1989 to 2005, measuring their sperm counts regularly, and found that counts fell about one third in that 16-year period, from 74 million per milliliter to about 50 million. A steady yearly decrease of about 2 percent took it that low.
A caveat: Studies on sperm counts have long been mired in controversy, as The Guardian writes, and the French study isn’t necessarily different just because it’s so expansive. The researchers may have sidestepped some issues but still run into others, like not accounting for the men’s socioeconomic status in the study, or not fully considering that doctors are getting better at measuring sperm count. As one scientist told the paper, “Sperm counting is difficult!”
Just as a caveat: If the French study is indeed correct, what could cause a wide drop in sperm count? I know that hormones from birth control pills have caused issues in fish living near waste water discharge pipes, but I wonder how these hormones (which don’t break down in nature) affect human males.If there is a drop in sperm count, it’s not clear what would be causing it, either. We don’t have the whole picture just yet.