In every other country, economic development and education has led to declining fertility, often to catastrophic levels.
Large parts of the 1st and 2nd world are facing national extinction within 50 years from a simple failure to have children.
Birthrates have declined well below the 2.1 replacement level to the (below 1.4) point of no return - where each generation will be 30% - 50% smaller than the last.
This affects almost the entire developed world, especially Europe, Japan & Korea as well as much of the 2nd world especially China, Iran and Turkey. Even the US seems to be heading this way with a dramatic decline in birthrate (from 2.08 to 1.76 in a decade).
Well before the absolute population decline is fully manifest, the failure to have children leads to national bankruptcy. The tax base collapses (from a decline in the working age (18-65) population) while national expenses skyrocket from the huge pension and health costs of fastest growing sector of society - the aged (65+).
No economic entity is able to survive such a massive reversal of income and expenses. It is part of the reason for the completely unsustainable debt levels of so many governments.
Sooner still, nations become unwilling and unable to defend themselves, as the military age (18-35) population plummets and the few children left become too precious to risk on the battlefield. This is already quite evident in Europe.
In some countries such as Turkey, Iran and parts of Europe the huge variation in birthrate between the virtually childless majority, dominant culture and fast breeding minorities threatens to rip the country apart.
It is a problem far more serious, immediate and factually indisputable than "global warming", yet receives a fraction of the attention.
Israel is the only exception, and has some lessons for the survival of the rest of everyone else.
See
https://mosaicmagazine.com/essay/2018/05/israels-demographic-miracle/