We're already doing those things. If you dropped the birth rate 50%, the population would still grow for the next few decades. Why? Because the primary cause o

We're already doing those things. If you dropped the birth rate 50%, the population would still grow for the next few decades. Why? Because the primary cause of population growth today isn't high birth rates - it's increased life expectancy. If you want to control the population, you'll have to resort to more old-fashioned means, like banning antibiotics and vaccine and the occasional genocide.