I have a hard time seeing the overpopulation argument as anything other than classist and racist nonsense.
It's not the vast majority in developing nations that are using up all our fossil fuels and poisoning the planet, it's us. And the damage being done in developing nations is nearly all to serve our needs in the developed world. We are the problem.
See also things like https://www.euronews.com/2019/06/10/carnival-cruise-ships-pr...