That was one cool article. I was reminded of this article from Slate, years ago:
Forget Overcrowding. The World Population Could Start Declining .
The world's seemingly relentless march toward overpopulation achieved a notable milestone in 2012: Somewhere on the…
They too, saw a common denominator of educating girls as a primary factor in a declining birth rate across humanity.
Your article adds the urbanization and empowerment of women to control birthing. And you also brought up the “not-of-kin” factor, that falls within urbanization. Those two factors only compound the rate of decline in the birth rate. Thanks for bringing those factors to our attention.
Very interesting to see this observation gaining traction.