One of Musk's favorite talking points is that having fewer children could lead to the collapse of human civilization.
At least maintain our numbers, he said during a conference in Miami earlier this week.
He said that having fewer kids is better for the environment.
He said the environment would be fine even if we doubled the size of the humans.
The kids will be alright, so have more of them before we run out.
Musk didn't give any evidence to back up his claims. He may have some credibility to his predictions.
Research shows that fewer people could cut carbon emissions. According to the study, having just one fewer child had the greatest effect on personal emissions, cutting on average 58 tons of CO2 emissions. Eliminating the car was second, cutting 2.4 tons of CO2.
It has been found that living a climate-friendly lifestyle can outweigh the effects of having more children. The picture is complicated by the fact that carbon emissions vary depending on where the person lives and how much they travel internationally.
The average Indian emits less than a tenth of the average American or Canadian, according to a 2020 report by Founder's Pledge, a London-based charity.
Most researchers agree that Earth is headed for an astonishing population decline, which could have several knock on effects. With fewer babies being born, some argue that the carbon footprint offsets may be pointless.
Without drastic changes to our behavior, our carbon footprint will likely only rise in the short term if the global population keeps growing.
The effects of natural population decline in Japan and China are harder to grasp.
If we have fewer kids, will humanity end in a whimper? If we don't take drastic action to ensure that a rapidly warming planet doesn't put an end, we won't get to see it.
If we doubled our population, the environment would be fine.
China's population is projected to fall by half within 30 years.