This is a morally- economically- and politically-charged topic, to which there is no easy answer. Sub-Saharan Africa will double in size by Having so many people living so closely together without adequate infrastructure causes environmental damage too.
But in all scenarios, world population will continue to grow for some time due to population momentum. But there are some developing countries where the birth rate is under control. On a global scale, not all humans are equally responsible for environmental harm.
Humans have always moved around the world.
Byanother billion had been added, in 40 instead of years time. Crucial for the long term trend will be the rate of decline of the number of births per woman, called total fertility.