At ever-decreasing rates as standard of living increases.

Mormons, Hasidic Jews, Hutterites, the Amish. These are all US communities that have had fertility rates well above average for generations. Those are all culture bound groups. Even if they were forcibly assimilated

> The heritability of fertility makes world population stabilization unlikely in the foreseeable future

https://www.sciencedirect.com/science/article/abs/pii/S10905...

Mormons and Catholics still show a pattern of decreasing fertility in recent years; they just had higher fertility before so they are merely around the level that mainline Protestants were once at.

I agree that in the long run, the fertility trend will reverse itself. But in the medium term, it’s not an excuse for not fixing global poverty.