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In the 15 years or so that I have been actively researching the prospects for the end of the world (Brace for Impact came out in 2009), it has always been in the back of my mind to be on the lookout for a ringer — the thing that would do us in finally while we were intently watching 20 other things and expecting one of them to do it. It might be here.
Sperm counts. I did not see that one coming. In the western industrialized nations sperm counts dropped nearly 60% between 1973 and 2011, which is worrisome. Fertility rates in half the world’s countries are now below the replacement level, which worries the industrialists. But now, the epidemiologist who conducted that sperm-count study has projected that on the current track, sperm counts will hit zero in 2045. This wouldn’t be the end of the world, of course. Just the end of the human race. Continue reading