Overview
- Researchers led by Alessio Zaccone and the late Kostya Trachenko published a peer‑reviewed model in Chaos, Solitons & Fractals that was calibrated on roughly 12,000 years of population data to reproduce historical growth patterns.
- Under a deliberately conservative worst‑case assumption that Earth’s sustainable carrying capacity instantaneously fell to about two billion people, the model produces a rapid population decline that would halve humanity by around 2064.
- The authors stress this halving is an illustrative mathematical scenario rather than a forecast and report that their baseline analysis does not indicate an imminent global collapse.
- The paper identifies plausible triggers that could sharply cut carrying capacity—extreme climate breakdown, a large pandemic, widespread conflict, or major resource shortages—and also shows a different set of assumptions can produce a runaway‑growth (singularity) regime.
- The study has prompted intense media attention that framed the worst‑case outcome in dramatic terms, and it underlines how sensitive long‑term population and policy planning are to abrupt ecological and social shocks that would affect food, health systems, and economic stability.