If a universal basic income started today with the stipulation that you had to put 40 hrs/wk towards making the world a better place or solving societal problems, how would you spend your time?
Spreading awareness and availability of birth control and family planning. We've been above global carrying capacity for a long time now, and it will end badly. I'd try to soften the blow.
Good point, if people are inclined to be child-free, we should celebrate that and support them, not nag them every Christmas and ask when they're gonna have kids, also it's what allows others to have kids without contributing as much to overpopulation. It also means kids end up with parents who actually wanted kids. I'm totally on board with this.