The answer to when the world’s population will stop growing has to do with how many children are born each year.
We know that children born today will have children in the future.
So if fewer children are born today, fewer children will be born in the future.
In most countries of the world, women are having fewer children than their mothers did, and most population experts think this trend will continue.
If, eventually, the average number of children born to each woman drops to 2.1, called the replacement level, the population will no longer grow.
That’s because those two children will exactly replace their mother and father.