Sperm Count & Fertility Collapse
Mean sperm concentration fell from 101 to 49 million per ml between 1973 and 2018, and the decline accelerated after 2000. Projected on that slope, the average drops below 40 M/ml — the level under which the odds of conception start to fall — around 2026.
Sources: Levine et al. 2022, Human Reproduction Update · Threshold: Bonde et al. 1998, The Lancet

