“Sperm counts are collapsing worldwide.”
Large pooled analyses report substantial declines over decades, so the concern is real. “Collapsing worldwide” overstates how uniformly the data represent countries and what they establish about future fertility.
Research pooling many studies reports declining average sperm counts over recent decades. That deserves attention, but it does not show that every country, every man or humanity's fertility is on the same path. A sperm-count trend is not proof of an inevitable fertility collapse.
The major global analysis combined different groups of men sampled between 1973 and 2018. It did not repeatedly test a representative world population or establish the cause of the trend.
Safety note: A population trend cannot tell you your own sperm count or ability to conceive.
Talk to a healthcare professional if: Use a clinical fertility assessment for a personal concern, not a headline-based diagnosis.
Take reproductive health research seriously without treating a projected catastrophe as settled fact.
Look for measured trends, population coverage and uncertainty rather than extrapolated countdowns.