*Why [a considerable fraction of] a generation is choosing to be child-free.*

If technological society survives global heating disaster, our descendants 150 years from now (perhaps one or two billion of them) will decide how many children to make each year, then recruit parents to raise them. They will attract plenty of volunteers for that role by making other aspects of life easy and safe for them. This way they can maintain a stable population and assure everyone grows up loved.