Elon Musk, CEO of Tesla, warned again of "population collapse" on Tuesday. He has said in the past that this may be the biggest risk facing the future of human civilization Musk, 50, is the father of seven children. He said the U.S. fertility rate has been below the lowest sustainable level for about 50 years.
The billionaire entrepreneur is on twitter The U.S. Centers for Disease Control and Prevention (CDC) fertility data were shared on the, showing that last year's fertility rate was still below the replacement level of 2.1.
Musk also laments that the richer people are now, the less they want children. He himself is a rare exception. "Contrary to what many people think, the richer a person is, the fewer children he has. I am a rare exception. Most people I know have no or only one child," he wrote
"Then why is it that the richer a person is, the fewer children he will have?" Musk asked.
Earlier this month, musk expressed concern about Japan's declining birth rate and rising mortality rate, saying that if Japan's fertility rate continued to decline, the country would eventually cease to exist.
Musk had previously repeatedly expressed concern about the decline in fertility, saying it was "one of the greatest risks of human civilization".
In January, musk talked about the population collapse and called on people to focus on having more children.
"We should be more worried about population collapse. If there is not enough population on earth, there will certainly not be enough population on Mars," he said
In an interview in April, musk said: "I'm really worried about the birth rate. It's been bothering me for many years because I can't see it getting better. It's getting worse year by year. My friends are going crazy by me."
"I spent a lot of time talking about the birth rate," Musk added. "This may be the greatest threat to the future of human civilization."