Earlier quoted context omitted.
Don't have to go that far. Choosing to not have children or choosing to have fewer children would be a good start. From what I understand, taking better care of the children we have so they have a better chance to reach healthy adulthood is the best way to suppress child birth rates. I say we because parents don't own their children. The children belong to all of us, the community.
That thought is considered sacrilegious for some reason. If we would just start shrinking back to healthy population levels, a lot of problems would disappear. But nooo, an impossible reduction of everyones climate footprint by 10% is offset within 10 years of population growth instead.
One of the reasons that “overpopulation” as a concept faces criticism is that not all humans are created equal so far as resource consumption goes. Less people in the global north would do far more good for the climate than less people in the global south, because the former have a several times higher per capita consumption. Some of the people concerned about “overpopulation” seem to think the problem is the latter group though, and in that context the outcome of “depopulation” would be pleasing to fascists.