Elon Musk: The birth rate is far below what's needed to sustain civilization

Elon Musk: "There are certainly some big risks that humanity faces. Population collapse is a really big deal, but I wish more people would think about...the birth rate is far below what's needed to sustain civilization at its current level. We need to take action on climate sustainability, which is being done, and we need to secure the future of consciousness by being a multi-planet species...Essentially it's important to take whatever actions we can think of to address the existential risks that affect the future of consciousness. Most people in the world are operating under the false impression that there are too many people. This is not true. Earth could maintain a population many times. The current level and the birth rate has been dropping like crazy. Unfortunately, like we have these like ridiculous population estimates from the UN that need to be updated because there just don't make any sense. Really, you can just look and say, what was the birth rate last year? Or how many kids were born. Multiply that by the life expectancy and say, okay, that's how many people will be alive in the future. And then say, is the trend for birth rate positive or negative? It's negative. That's the best case. Unless something changes with the birth rate."