Humanity faces a fragile future, with scientists warning that Earth's population of 8.3 billion could halve by 2064 under extreme conditions. New research suggests that climate collapse, pandemics, global conflict, or resource shortages could sharply reduce the planet's carrying capacity. While not a forecast, the study highlights how sensitive global population dynamics are to sudden environmental and social shocks.
Study Highlights Worst-Case Scenario
Researchers from the University of Milan published their findings in the journal Chaos, Solitons & Fractals. They warn that in a conservative worst-case assumption, Earth's sustainable capacity could fall to around two billion people. This would mean the maximum number of people the planet could support indefinitely would be just a quarter of today's population.
"The most provocative part of our paper explores hypothetical future scenarios," the researchers explained. "We modelled what could happen if major environmental crises abruptly imposed severe carrying-capacity limits on Earth."
Mathematical Modelling of Human Growth
The team analysed 12,000 years of human population growth, creating a mathematical equation that accurately reproduced major growth patterns from the Neolithic era to modern times. They found that while current trends remain relatively stable, the model shows how sensitive population dynamics are to abrupt environmental changes. "In a scenario where carrying-capacity constraints suddenly become abruptly active, our equation predicts a rapid population decline," they wrote.
Revisiting Past Predictions
The model revisits the famous "doomsday" prediction made in 1960, which claimed humanity would face extinction on Friday November 13, 2026, due to runaway growth. Fertility rates declined globally, avoiding that trajectory, but the researchers warn that similar mathematical risks could reappear under certain conditions.
Fertility Rates and Future Risks
Last year, a study suggested that populations may need a fertility rate of 2.7 children per woman to avoid long-term extinction, higher than the previous estimate of 2.1. In the UK, the average stands at 1.41 children per woman. In the US, it is slightly higher at 1.62. Falling fertility rates raise concerns about too few younger people to support ageing populations, pay taxes, and sustain healthcare and pension systems.
Elon Musk's Warning on Population Collapse
Tech billionaire Elon Musk has long warned about population collapse caused by declining birth rates. Musk, who has 14 children, has said: "always banging the baby drum." He argues that low birth rates could lead to fewer workers, increased debt, strained healthcare and pension systems, and even social unrest. He has described it as the "greatest risk to the future of civilisation."
New Earth with Conditions Suitable for Life Found
In a related development, Legit.ng earlier reported that a 'super-Earth' planet was found outside of the solar system that could have conditions suitable for life. According to experts at the University of Oxford, the planet known as HD 20794 d has a mass six times greater than Earth's and orbits within the 'habitable zone' of a star similar to the sun. The finding was published in the journal Astronomy & Astrophysics.
