This’ll cheer you right up: “Count Down: How Our Modern World Is Threatening Sperm Counts, Altering Male and Female Reproductive Development, and Imperiling the Future of the Human Race” by Shanna Swan.
“If you look at the curve on sperm count and project it forward — which is always risky — it reaches zero in 2045,” says Swan, meaning the median man would have essentially no viable sperm. “That’s a little concerning, to say the least. The current state of reproductive affairs can’t continue much longer without threatening human survival.”
“Of five possible criteria for what makes a species endangered,” Swan writes, “only one needs to be met; the current state of affairs for humans meets at least three (destruction of our environment, inadequate regulatory mechanisms, and man-made factors that affect our continued existence).”
All together now!
“Twenty-four years, stuck on my eyes
Twenty-four years, what a surprise
We’ve got twenty-four years, my brain hurts a lot*
Twenty-four years, that’s all we’ve got”
*like a warehouse, apparently.