ELON Musk has warned we could all end up in adult diapers in his latest wild prediction of humanity's collapse.
The billionaire, 50, made the shock remarks while discussing birth rates.
Speaking in Miami, he said we should "at least maintain our numbers".
"We don’t necessarily need to grow dramatically, but least let’s not gradually dwindle away until civilisation ends with all of us in adult diapers, in a whimper," he warned.
The world's richest man believes the world will actually be fine even if we double the population.
"Some people think that having fewer kids is better for the environment," he continued.
"It's total nonsense."
The Tesla founder has previously sounded the alarm, saying humanity could crumble "if people don't have enough children", Business Insider reports.
He also believes Japan could "cease to exist" if birth rates there continue to tumble.
The birth rate have began to bounce back in some countries after years of decline, such as in the US.
In the UK, 2021 data suggests women will have an average of 1.61 children during their lifetime, the first increase since 2012.
That's up on 2020, when the average was 1.58 children - the lowest at any time since before World War Two.
The World Health Organization (WHO) estimates the population will grow, reaching 9.7billion in 2050 - up from 7.7billion in 2019.
Musk - who is currently busy haggling a deal to buy Twitter - has a big plan is to send a million people on Mars by 2050 using SpaceX rockets.
Here's what you need to know...
Controversial billionaire Elon Musk was born in Pretoria, South Africa in 1971.
As a 12-year-old child he taught himself computer programming and sold the code of a video game to a PC magazine for $500 (£300).
At 17, he moved to Canada to study, before gaining two degrees in physics and business at the University of Pennsylvania.
At the age of 24 he moved to California to start a Ph.D. in applied physics and material science at Stanford University - but left the programme after just two days to pursue other projects.
Now 50, he is the founder and CEO of SpaceX, co-founder, CEO and product architect of Tesla Motors, co-founder and chairman of SolarCity, co-chairman of Opan AI, co-founder of Zip2 and founder of X.com, which merged with PayPal.
He's also working on a human brain chip project called Neuralink.
Musk's stated aim is to reduce global warming and save humans from extinction by setting up a colony on Mars.
The billionaire inventor is also working on the world's largest lithium-ion battery to store renewable energy.
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