If he doesn’t have the kid though, someone else will. It’s the same for any animal species. There is a limit and a certain sustainable population. If humans are going to experience some die off, it’s still better to have more population than less even if population is the catalyst. I think it is obvious at this point that we aren’t going to change the course by choice. It will be forced upon us. The losers will be those in 3rd world countries who can’t afford to relocate or simply get stuck in the path of destruction and they can’t afford to rebuild homes and infrastructure. E.g. Haiti after earthquake and hurricanes. Climate change isn’t a nuclear armageddon and deciding not to have children will do nothing to change the course. It just means someone else will unless the entire world agreed to a child policy which isn’t practical or realistic. Eugenics should have been further researched and enforced 100 years ago.