The Times Australia
The Times World News

.

Is there really a 1 in 6 chance of human extinction this century?

  • Written by Steven Stern, Professor of Data Science, Bond University
Is there really a 1 in 6 chance of human extinction this century?

In 2020, Oxford-based philosopher Toby Ord published a book called The Precipice[1] about the risk of human extinction. He put the chances of “existential catastrophe” for our species during the next century at one in six.

It’s quite a specific number, and an alarming one. The claim drew headlines[2] at the time, and has been influential since – most recently brought up by Australian politician Andrew Leigh in a speech[3] in Melbourne.

It’s hard to disagree with the idea we face troubling prospects over the coming decades, from climate change, nuclear weapons and bio-engineered pathogens (all big issues in my view), to rogue AI and large asteroids (which I would see as less concerning).

But what about that number? Where does it come from? And what does it really mean?

Coin flips and weather forecasts

To answer those questions, we have to answer another first: what is probability?

The most traditional view of probability is called frequentism, and derives its name from its heritage in games of dice and cards. On this view, we know there is a one in six chance a fair die will come up with a three (for example) by observing the frequency of threes in a large number of rolls.

Or consider the more complicated case of weather forecasts. What does it mean when a weatherperson tells us there is a one in six (or 17%) chance of rain tomorrow?

Read more: The science of weather forecasting: what it takes and why it’s so hard to get right[4]

It’s hard to believe the weatherperson means us to imagine a large collection of “tomorrows”, of which some proportion will experience precipitation. Instead, we need to look at a large number of such predictions and see what happened after them.

If the forecaster is good at their job, we should see that when they said “one in six chance of rain tomorrow”, it did in fact rain on the following day one time in every six.

So, traditional probability depends on observations and procedure. To calculate it, we need to have a collection of repeated events on which to base our estimate.

Can we learn from the Moon?

So what does this mean for the probability of human extinction? Well, such an event would be a one-off: after it happened, there would be no room for repeats.

Instead, we might find some parallel events to learn from. Indeed, in Ord’s book, he discusses a number of potential extinction events, some of which can potentially be examined in light of a history.

A photo of the Moon with craters highlighted.
Counting craters on the Moon can gives us clues about the risk of asteroid impacts on Earth. NASA[5]

For example, we can estimate the chances of an extinction-sized asteroid hitting Earth by examining how many such space rocks have hit the Moon over its history. A French scientist named Jean-Marc Salotti did this in 2022[6], calculating the odds of an extinction-level hit in the next century at around one in 300 million.

Of course, such an estimate is fraught with uncertainty, but it is backed by something approaching an appropriate frequency calculation. Ord, by contrast, estimates the risk of extinction by asteroid at one in a million, though he does note a considerable degree of uncertainty.

A ranking system for outcomes

There is another way to think about probability, called Bayesianism after the English statistician Thomas Bayes. It focuses less on events themselves and more on what we know, expect and believe about them.

In very simple terms, we can say Bayesians see probabilities as a kind of ranking system. In this view, the specific number attached to a probability shouldn’t be taken directly, but rather compared to other probabilities to understand which outcomes are more and less likely.

Read more: Bayes' Theorem: the maths tool we probably use every day, but what is it?[7]

Ord’s book, for example, contains a table of potential extinction events and his personal estimates of their probability. From a Bayesian perspective, we can view these values as relative ranks. Ord thinks extinction from an asteroid strike (one in a million) is much less likely than extinction from climate change (one in a thousand), and both are far less likely than extinction from what he calls “unaligned artificial intelligence” (one in ten).

The difficulty here is that initial estimates of Bayesian probabilities (often called “priors”) are rather subjective (for instance, I would rank the chance of AI-based extinction much lower). Traditional Bayesian reasoning moves from “priors” to “posteriors” by again incorporating observational evidence of relevant outcomes to “update” probability values.

And once again, outcomes relevant to the probability of human extinction are thin on the ground.

Subjective estimates

There are two ways to think about the accuracy and usefulness of probability calculations: calibration and discrimination.

Calibration is the correctness of the actual values of the probabilities. We can’t determine this without appropriate observational information. Discrimination, on the other hand, simply refers to the relative rankings.

Read more: Longtermism – why the million-year philosophy can't be ignored[8]

We don’t have a basis to think Ord’s values are properly calibrated. Of course, this is not likely to be his intent. He himself indicates they are mostly designed to give “order of magnitude” indications.

Even so, without any related observational confirmation, most of these estimates simply remain in the subjective domain of prior probabilities.

Not well calibrated – but perhaps still useful

So what are we to make of “one in six”? Experience suggests most people have a less than perfect understanding of probability (as evidenced by, among other things, the ongoing volume of lottery ticket sales). In this environment, if you’re making an argument in public, an estimate of “probability” doesn’t necessarily need to be well calibrated – it just needs to have the right sort of psychological impact.

From this perspective, I’d say “one in six” fits the bill nicely. “One in 100” might feel small enough to ignore, while “one in three” might drive panic or be dismissed as apocalyptic raving.

As a person concerned about the future, I hope risks like climate change and nuclear proliferation get the attention they deserve. But as a data scientist, I hope the careless use of probability gets left by the wayside and is replaced by widespread education on its true meaning and appropriate usage.

Read more: 433 people win a lottery jackpot – impossible? Probability and psychology suggest it's more likely than you’d think[9]

Read more https://theconversation.com/is-there-really-a-1-in-6-chance-of-human-extinction-this-century-215054

Times Magazine

DIY Is In: How Aussie Parents Are Redefining Birthday Parties

When planning his daughter’s birthday, Rich opted for a DIY approach, inspired by her love for drawing maps and giving clues. Their weekend tradition of hiding treats at home sparked the idea, and with a pirate ship playground already chosen as t...

When Touchscreens Turn Temperamental: What to Do Before You Panic

When your touchscreen starts acting up, ignoring taps, registering phantom touches, or freezing entirely, it can feel like your entire setup is falling apart. Before you rush to replace the device, it’s worth taking a deep breath and exploring what c...

Why Social Media Marketing Matters for Businesses in Australia

Today social media is a big part of daily life. All over Australia people use Facebook, Instagram, TikTok , LinkedIn and Twitter to stay connected, share updates and find new ideas. For businesses this means a great chance to reach new customers and...

Building an AI-First Culture in Your Company

AI isn't just something to think about anymore - it's becoming part of how we live and work, whether we like it or not. At the office, it definitely helps us move faster. But here's the thing: just using tools like ChatGPT or plugging AI into your wo...

Data Management Isn't Just About Tech—Here’s Why It’s a Human Problem Too

Photo by Kevin Kuby Manuel O. Diaz Jr.We live in a world drowning in data. Every click, swipe, medical scan, and financial transaction generates information, so much that managing it all has become one of the biggest challenges of our digital age. Bu...

Headless CMS in Digital Twins and 3D Product Experiences

Image by freepik As the metaverse becomes more advanced and accessible, it's clear that multiple sectors will use digital twins and 3D product experiences to visualize, connect, and streamline efforts better. A digital twin is a virtual replica of ...

The Times Features

What Makes Certain Rings or Earrings Timeless Versus Trendy?

Timeless rings and earrings are defined by designs that withstand the test of time, quality craftsmanship, and versatility. Trendy pieces, on the other hand, often stand testimony ...

Italian Street Kitchen: A Nation’s Favourite with Expansion News on Horizon

Successful chef brothers, Enrico and Giulio Marchese, weigh in on their day-to-day at Australian foodie favourite, Italian Street Kitchen - with plans for ‘ambitious expansion’ to ...

What to Expect During a Professional Termite Inspection

Keeping a home safe from termites isn't just about peace of mind—it’s a vital investment in the structure of your property. A professional termite inspection is your first line o...

Booty and the Beasts - The Podcast

Cult TV Show Back with Bite as a Riotous New Podcast  The show that scandalised, shocked and entertained audiences across the country, ‘Beauty and the Beast’, has returned in ...

A Guide to Determining the Right Time for a Switchboard Replacement

At the centre of every property’s electrical system is the switchboard – a component that doesn’t get much attention until problems arise. This essential unit directs electrici...

Après Skrew: Peanut Butter Whiskey Turns Australia’s Winter Parties Upside Down

This August, winter in Australia is about to get a lot nuttier. Skrewball Whiskey, the cult U.S. peanut butter whiskey that’s taken the world by storm, is bringing its bold brand o...