Elon Musk has been commenting for some years now on the threat of population decline, not expansion as the environmentalists are obsessed with. As he pointed out in a recent tweet, declining fertility combined with an ageing population, in places like Japan is going to lead societies ceasing to function, as Japan’s prime minister recently warned. In the US, despite runaway immigration from illegals, mainly men, the Social Security system's Central Trust Fund's reserves will be depleted in 2033, due to the ageing population, and immigrants are not immortal, and age as well. US births have dropped an average of 2 percent a year since 2014, and show no indication of coming out of the nose dive. “Population collapse is a major risk to the future of civilization,” Musk has said.
He is correct, but matters are even worse, with the decline human sperm quality and quantity; over the past 50 years sperm counts have declined by more than 50 percent across the planet, and if the trend continues, thought to be caused by hormone-altering chemicals that are everywhere, then according to one prediction, humanity will face extinction, or at least, a reproduction crisis: