Well most developed nations have dropped below replacement rate on new births with population growth only sustained by immigration. We'll likely soon seen what the "less is more" looks like for new people, I'm not optimistic.
People seem to understand that if you move a factory from one country to another you haven't decreased its pollution, especially if the new country has laxer environmental regulations. If you offshore population growth, you haven't decreased population growth either.
I'm not that optimistic either, but hope we learn from examples like Mechai Viravaidya in Thailand https://www.youtube.com/watch?v=sgMNhMRgkHE that nations can manage populations voluntarily, increasing stability, peace, and abundance per person -- no eugenics, One Child policy, or racism. More like the opposite.
Huge mistakes were made some time ago and there's no recovery in sight.
While there is less research into men's fertility and education, in developed countries evidence suggests that highly-educated men display higher levels of childbearing compared to less-educated men.
Education however reduces women’s fertility.
The people that built the modern world voluntarily phase themselves out.