I know it'd be difficult to get society to agree to it, but how would you feel about the idea of enforcing a law for people to require a license to have children?
This would ensure two things:
1) Population control. - If we limit the right to have children to responsible people, it would help prevent human overpopulation. The population growth would likely still be on the up rise, but at least it'd be more in control.
2) Better parenting. - In order to obtain a license, the parents would have to prove themselves responsible to have a child. They would have to prove that they would be suitable parents to raise a child, beneficial to the child's upbringing and mental health. Creates a better life for the child, and in turn it creates a better adult, and in turn of that it creates a better society full of better adults.
Those that have children without having a license, unfortunately, would have their child taken away to adoption. If they want a child, they should work to get that license in the first place. And if there was something preventing them from getting that license, maybe they should've thought more about if having a child would've been a good idea in the first place.