Elon Musk has said that declining birth rates present “the biggest danger civilization faces by far.” In fact, he quips that he's taking the problem on personally—saying he was “doing [his] best to help curb the underpopulation crisis” in response to a Business Insider report that he had secretly fathered twins with an executive at his brain-implant company, Neuralink.
But it looks like it will be a few decades at least before population collapse will begin posing a problem.
