Cedarford:

“High birth rates have led to breeding exceeding what the economy needs in workers and what the land can support.”

The population explosion you reference derives more from low Death rates, than from high birth rates.

The birth rates in the undeveloped regions you reference have always been high, and when western institutions introduced modern standards of hygiene to those populations, perinatal, infant, and maternal morality rates plummeted.

Of course in the developed countries, birth rates fell as the economies boomed and women gained voting rights and moving into the work force.

So the answer to many of the population problems you reference appears to be the lowering of birthrates via Enfranchisement of the Women.

The only real alternative…

higher death rates.