Call me when the global birth rate is falling.

I'm sorry, I can't hear you over the sound of the phone ringing.
UN Data shows the Fertility Rate falling from ~2.7 Births per Woman in 2000 to ~2.3 Births per Woman in 2024. Here is a handy chart of the data from 1960 to 2021. Global birth rates have been falling for most of the 20th and 21st centuries. Barring a major shift in demographics, the world's population should peak this century. That isn't a terrible thing, and probably a good thing from a climate perspective. But, it will have economic consequences which we will need to deal with (aging populations, economic stagnation, shrinking workforces, shrinking economies). None of this has to be a problem, but those types of demographic changes can cause societal instability.