Kathrine Frich
Hitting that milestone is not going to happen overnight.
Looking toward the future is a deeply natural human habit.
But when experts start using complex math to figure out exactly how many tomorrows we have left, the answers can get a little unsettling.
A grim calculation
For years, scientists have debated the timeline of our ultimate extinction. Much of this centers around the doomsday argument, a concept rooted in studies on the anthropic principle published by the Royal Society.
Math experts start their work by looking at the estimated 117 billion people who have ever walked the planet. They then place today’s population at a random point on our timeline.
Those calculations assume that everyone born up to this point represents just five percent of all the humans who will ever live. That leaves a massive chunk of our species unaccounted for.
To find the final number, experts simply multiply the historical total by twenty. This brings the final headcount to a staggering 2.34 trillion humans.
Racing against the clock
Hitting that milestone is not going to happen overnight. At current birth rates, experts estimate it will take about 17,100 years to reach the final generation.
Some scientists strongly reject this rigid formula. They argue the math ignores our ability to invent life-saving technologies or eventually build colonies on other planets.
But a newer report suggests our global numbers might actually crash long before that distant deadline.
A sharper drop
A recent study published in ScienceDirect paints a much faster timeline. Researchers from the University of Milan looked closely at exactly how our fragile environment handles sudden population stress.
“The most provocative part of our paper explores hypothetical future scenarios,” the research team explained, noting that severe climate shocks could force drastic changes very soon.
“We modelled what could happen if major environmental crises abruptly imposed severe carrying-capacity limits on Earth. Under a deliberately conservative worst-case assumption that Earth’s sustainable carrying capacity suddenly dropped to around two billion people, our model predicts a rapid global population decline, with humanity potentially halving by around the year 2064.”
Whether we face a slow fade over millennia or a sudden drop in decades, the clock is certainly ticking.
Sources: ScienceDirect, The Royal Society, University of Milan
