When will the human population drop below 1 billion

Manifold·Health·ends Jan 1, 2100

As of 10:34 UTC on 19 Aug 2026, “After 2100” leads “When will the human population drop below 1 billion” on Manifold at 76%, followed by “Never” at 7% and “2040s” at 5%, out of 10 outcomes. The event has no Manifold-reported volume in the last 24 hours. pdata.world compares it with 24 related events on Manifold and Kalshi.