The real issue, the worst issue, the humanity faces today is not population growth.
It is uneven distribution of wealth. 1% of the world owns 82% of the wealth.
Even if somehow you make it, 1% of the world owning 50% of the wealth, there will be no poverty in the world.
The same countries that are telling their population to have less kids.
Population decline is much more scarier than population growth.
But..
Why Chinese Government issue policies on population control.? Earth Resources are not unlllimited. On the other hand An awful truth is ,it is harder to control overpopulation in poor countries in developed countries 1/3 of pregnancies are unwanted.Its mainly due to the lack of sex education and unavailability of contraceptive products.