> The point is that "I don't want to have children because I'm worried about the impact of climate change" (social) or "I don't want to have children because I think it'll be too expensive" (economic) is not caused by biology
How do you know that? Are those really the reasons, or is the underlying reason "I don't really feel an urge to want kids, so I'm using this reason to justify it"?
Evolution works slowly, but that's because most traits have fairly minimal benefits. Marginally better eyesight might mean a 2% better chance of procreating. Assuming there's some genetic factor for "emotional desire to have children regardless of the circumstances", the chance of procreation rate for that is rapidly approaching 100%.
It's obviously far more complicated than that - it will be an interesting question for future biologists - if there are any!
How do you know that? Are those really the reasons, or is the underlying reason "I don't really feel an urge to want kids, so I'm using this reason to justify it"?
Evolution works slowly, but that's because most traits have fairly minimal benefits. Marginally better eyesight might mean a 2% better chance of procreating. Assuming there's some genetic factor for "emotional desire to have children regardless of the circumstances", the chance of procreation rate for that is rapidly approaching 100%.
It's obviously far more complicated than that - it will be an interesting question for future biologists - if there are any!