What the UN’s Actual Projections Say
What You Need to Know
- Reaction to the viral post: Elon Musk reacted to a post claiming 2026 could be the first year in history that humanity falls below the replacement level, simply replying, “I’ve been warning about this for years,” without providing any new data.
- What the data says: UN figures contradict the claim. The global fertility rate stood at 2.2 births per woman in 2025 (above the replacement level of 2.1), and the world’s population isn’t expected to start shrinking until the mid-2080s, after peaking at 10.3 billion.
- The reality of the issue: Despite the hype around this specific claim, the crisis is real across multiple regions. Countries like China, South Korea, and Germany are already experiencing decline, while other nations with fertility rates over 5 births per woman continue to hold up the global average.
The Claim That Went Viral
Elon Musk reignited the demographic alarm after responding to a post on X about the global fertility rate. The post claimed that 2026 could be the first year in history in which humanity falls below the population replacement level.
The post described the scenario as an “existential crisis” that had never occurred before, not even during wars or pandemics. Tesla CEO Elon Musk responded bluntly: “I’ve been warning about this for years,” without presenting any new data.
I’ve been warning about this for years https://t.co/kHFPFjNkE7
— Elon Musk (@elonmusk) August 23, 2026
What the Data Actually Show
Despite the attention surrounding the warning, the available data do not support the prediction for 2026. According to Our World in Data, the global fertility rate stood at roughly 2.2 children per woman in 2025, remaining above the replacement level of 2.1.
The world’s population is expected to continue growing until it peaks at 10.3 billion in the mid-2080s, when the UN projects that global population decline will begin. The world’s population currently stands at around 8.3 billion people.
Musk Isn’t New to This Talking Point
The billionaire’s concern is longstanding and recurring. In 2022, Musk declared that “population collapse due to low birth rates is the biggest danger civilization faces,” arguing that population decline posed a far greater risk to civilization than global warming.
In June 2026, he returned to the issue to highlight India’s situation, as the country’s national fertility rate had fallen below 2.1 children per woman. Musk noted that fertility among more highly educated people had already fallen below that level years earlier.
Where the Decline Is Already Real
Even though the global average remains above 2.1, population decline is already a reality in several countries. China is facing its fourth consecutive year of decline, while South Korea has seen a continuous decline in its number of citizens since 2021, even though its total population has grown again in recent years due to increased immigration.
In Germany, deaths have outnumbered births since 1972. Japan, Italy, and Greece, along with Cuba, are also facing strong demographic pressure, while OECD countries average just 1.46 children per woman.
By contrast, Niger and Chad maintain fertility rates above 4 children per woman, helping keep the global average higher. In Sub-Saharan Africa, Somalia and the Democratic Republic of the Congo have fertility rates close to or at around 6 children per woman, while Angola stands at about 5. In South Asia and the Middle East, Afghanistan and Yemen continue to record fertility rates above 4 children per woman.
A Rapidly Aging World
Fertility rates have fallen globally from around 5 children per woman in the 1950s to just over 2 today.
The combination of longer life expectancy and lower fertility has resulted in unprecedented population aging, gradually reshaping the world’s age structure.
A Real Problem, But Not an Imminent Collapse
Musk’s warning points to a genuine dilemma: two-thirds of the world’s population already live in places where fertility rates are below the replacement level.
Housing shortages, financial instability, and uncertainty about the future are all discouraging people from having children. However, the specific claim about 2026 is not supported by the available data, suggesting that the demographic challenge is a gradual and profound demographic transition, rather than an imminent collapse.
Sources and References
- Our World in Data — Countries with Fertility Rates Above/Below Replacement
- United Nations (UN) — World Population Prospects 2024
- X (formerly Twitter) — Elon Musk’s statements on demographics (Post 1 | Post 2)
- Livemint — India’s Fertility Rate Decline
- Reuters — Demographic Data and Population Decline in China
- Yonhap News Agency — Report on South Korea’s Birth Rate
- OECD — Pensions at a Glance 2023 Report
- Demographer.org — Demographic Statistics for Cuba
- Destatis (Germany) — Federal Statistical Office of Germany
- World Bank — Gender and Fertility Rate (TFR) Data Portal
- United Nations (UN) — World Population Day