These two effects are not similar in scale. Fertility across the globe is falling by a lot. Africa went from 6.7 to 4.2 in a span of 50 years. Asia went from 6 to 1.9.
Anywhere but least developed countries child mortality is low, such that fertility replacement level is estimated at 2.1 (vs 2.0 if everyone survived until reproductive age).
We used to have 5-6 kids, with one dying if you were a bit unlucky (statistically speaking). Now we have 2 or less.
Anywhere but least developed countries child mortality is low, such that fertility replacement level is estimated at 2.1 (vs 2.0 if everyone survived until reproductive age).
We used to have 5-6 kids, with one dying if you were a bit unlucky (statistically speaking). Now we have 2 or less.