Sperm concentration has declined 50 percent in 40 years

The quality of sperm from men in North America, Europe and Australia has declined dramatically over the past 40 years with a 52.4 percent drop in sperm concentration, according to a study published Tuesday. The research — the largest and most comprehensive look at the topic, involving data from 185 studies and 42,000 men around the world between 1973 and 2011 — […]

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