Society engineered to reduce population growth. The natural evolution of carnivorous mammals in the wild extended to homo sapiens according to some. Lone wolves and non alpha females. Notice how population increase in more prosperous engineered societies can be defined by decrease in birth rates. There is purposeful action to change the math involved. See Ted Talks * this site is great at making critically thought out explanations simple enough for anyone to understand and expand on * . IMO… Changes are partially species responses regulated by evolutionary biological responses and partially purposeful social engineering policy set in motion.
You can lament the societal change and you can live your life outside the mind washed madding crowd but the reach of societal engineers will effect the attitudes and actions of the majority and change will happen.