Scientists Predict When Humans Could Go Extinct And Claim It Is 95% Accurate

Scientists have tried to work out how long humanity may have left, and the answer is not exactly comforting.

This is far from the first attempt to put a date on humanity’s possible end. The estimates can be wildly different depending on the method, the assumptions, and what kind of risk is being measured.

One Nobel Prize-winning physicist has warned humanity could face destruction in about 30 years. On the other end of the scale, a supercomputer from the University of Bristol in the UK has suggested humans may still have about 250 million years.

This prediction lands between those two extremes. The scientist behind it claims the result is 95 percent accurate, though the reasoning is more unusual than a normal forecast about climate, war, or disease.

Instead of looking at one disaster, the idea starts with population and probability. That is why it can sound strange at first, even before the final date comes into the picture.

The argument goes back to 1983, when astrophysicist Brandon Carter proposed what became known as the 'doomsday argument'.

The math predicts when humanity will end Getty Stock Images

Why this prediction is not like a normal end-of-the-world warning

Most extinction warnings focus on something concrete, such as nuclear weapons, climate change, pandemics, or a future disaster we can at least picture. Carter’s idea is different because it is based on where we might sit in the total number of humans who will ever live.

That makes it more like a probability puzzle than a direct warning about something already happening. It does not say a specific event will destroy humanity in the year 19,100 AD.

Instead, it asks whether we should expect to be living near the beginning of human history, near the end, or somewhere closer to the middle.

Carter began by estimating how many humans had ever lived. He put that figure at 117 billion, which becomes the starting point for the whole calculation.

For comparison, the current world population is a little over eight billion, so the number of people alive now is still only a small slice of every person who has ever been born.

From there, Carter used the Copernican principle, drawing from the reasoning linked to astronomer Nicholas Copernicus. Copernicus is famous for showing that Earth is not the center of the universe and instead orbits the Sun.

Carter applied that same kind of thinking to humanity. If every human life were placed on one long timeline, he argued it would be more likely that we occupy a random position than a special spot right at the beginning or right at the end.

In other words, the argument asks us not to assume we are living at the opening chapter of a story that will go on for trillions of people.

Why probability points to thousands of years, not endless generations

This is where the idea needs a little focus. Borrowing an analogy from Scientific American, imagine two boxes. One contains balls numbered one to ten, while the other contains balls numbered one to 100,000.

If someone pulls out a ball numbered four, it is far more likely to have come from the box with only ten balls. It could come from the bigger box, but the odds are much lower.

Carter’s argument uses a similar idea. If we are somewhere around the 177-billionth human birth, then statistically it may be more likely that we are closer to the middle of all human births than sitting near the start of trillions and trillions of future lives.

It believes there are still trillions of people left to live Getty Stock Images

Why the number sounds so strange

The strange part is that this argument does not need to know what actually ends humanity. It only looks at the chance that our birth rank is a normal-looking place in the full human timeline.

That is also why many people find it hard to accept. A mathematical pattern can point toward one outcome, but it does not explain the real-world cause that would make that outcome happen.

Still, the idea has stuck around because it forces a sharp question: are we really at the start of a huge future civilization, or are we much later in the human story than we like to think?

Using that logic, Carter estimated that about 2.34 trillion people will be born in total.

That figure is far larger than the number of humans who have already lived, but it is much smaller than a future where humanity spreads for millions of years and produces countless generations.

Once that total is set, the next question becomes how long it would take for human births to reach it.

How the prediction reaches the year 19,100 AD

Roughly 130 million babies have been born each year for the past 40 years. If that rate stayed the same, it would take around 17,100 years for total human births across history to reach 2.34 trillion.

That puts the worrying date somewhere around 19,100 AD, at least under this line of reasoning.

Of course, not every scientist agrees with Carter’s conclusion. The whole argument depends on probability, assumptions about birth rank, and a steady birth-rate estimate, so it starts to feel less solid the more closely you question each part.

The biggest catch is that the prediction is based on math, not on a clear event already unfolding in the world.

That means it does not directly account for whether humanity avoids nuclear war, slows climate change, develops safer technology, or survives threats that have not appeared yet.

Even so, the number is uncomfortable. If Carter’s reasoning is anywhere close, humanity’s timeline may be much shorter than people like to imagine. Gulp.