[IdiocyInAction]

It's not just less pollution though. It's less people that might fulfill valuable societal roles that scale with the number of people and in many developed countries less people to look after/produce value for those in old age, which will lead to all sorts of unpleasantness.

Also, non-modern farm practices are also not ideal and I think if we were forced to switch to traditional agriculture we would still have a large adverse effect on ecosystems.