It’s definitely a massive change, but it’s worth noting we don’t exactly have long term numbers on this. The first studies on sperm count are from 1929, and we

It’s definitely a massive change, but it’s worth noting we don’t exactly have long term numbers on this. The first studies on sperm count are from 1929, and we started to see this issue in the 1970s. It could be that we’re seeing a drop down from a period where sperm counts were unnaturally high for some reason, as opposed to a lowering below baseline human levels. (Do I think that’s likely? No, probably we’re seeing the affect of one of the many chemicals that have been introduced over the last 100 years. But it’s always worth thinking through all possibilities)