I strongly suspect that our species is already on its way to inevitable extinction, and much more quickly than a few hundred years.<p>Barring some science fiction scenarios, fertility has dropped below replacement and is of a nature where it never truly rises. Children who grow up in a low-fertility environment learn behaviors and personality traits that encourage and enhance the already-low fertility, and any who are atypical and have above-replacement fertility themselves are never enough to get the global average back to (or above) replacement. Not only have we trained the kids to have few kids themselves, we&#x27;ve trained them to train those few kids of their own the same (but with extra!).<p>You can disagree, almost everyone does. But the implications of disagreement are bizarre, you must imagine some future where all 5th generation-only children wake up and say &quot;I want 2.1 children&quot; or 10 percent of those 5th generation children wake up and say &quot;I want 20 children&quot;.