In 1968, a book called The Population Bomb hit the shelves predicting nothing less than a full-on apocalypse. Authors Paul and Anne Ehrlich advocated for aggressive population control—guaranteed abortion rights, abundant contraception, the whole nine yards. They warned that anything less would result in global famines humanity couldn't survive.
As you’re probably aware, that… didn’t happen. Technology moved forward; birth rates dropped of their own accord; we even had a third agricultural revolution. Which just goes to show: you never can tell what the future holds.
So, when a new paper predicts a potential halving of the global population within the next four decades, it’s easy to be skeptical. But this time, the math is different.
The Discovery
If you’re looking for a specialist in human population dynamics, the condensed matter physics department probably isn’t where you’d head. But that’s exactly where Professor Alessio Zaccone found the answer.
Working on the physics of glass—a material that is neither a solid nor a liquid—Zaccone utilized "stretched-exponential" equations to describe how its molecular structure relaxes. Through a chance collaboration, he realized these same equations could describe 12,000 years of human population growth.
The "Doomsday" scenario isn't a prophecy. It is a mathematical "stress test" of a complex, nonlinear system. To understand the risk, we have to visualize the data.
