In case you’re wondering (like I did) whether Elon Musk walks the walk he’s talking here, he does:

“I think one of the biggest risks to civilization is the low birthrate and the rapidly declining birthrate,” Musk explained on Monday evening, as recorded by the New York Post.

“And yet, so many people, including smart people, think that there are too many people in the world and think that the population is growing out of control,” Musk continued. “It’s completely the opposite. Please look at the numbers — if people don’t have more children, civilization is going to crumble, mark my words.”

Musk has six boys of his own.  Of course, most people won’t have the advantages he does if they separate from spouses with whom they have five children, but life happens, and I don’t know enough about him to judge.