Birthrates are plummeting worldwide. Can governments turn the tide? Nations are deploying baby bonuses, subsidised childcare and parental leave – largely to no avail.
"Overpopulation" is bunk. We have the resources to sustain 8 billion people, (or more, really) just not 8 billion Americans. But when people say there's too many people, it's usually a eugenicist argument that really means "there's too many people in those poor countries."
I hear eugenists say "there's not enough people" in place of "we need more specially white folk so the uneducated colored don't replace us" far far more often, see Elon musk and the like.
I've actually only ever heard "there's too many people" come from anti capitalists.
Your entire argument is climate change? You do know climate change is not a root problem, it is a symptom right? Kill capitalism and you save the planet.
Also, you're just proving my point. The vast majority of ecological destruction and GHG emissions come from the top 10% of the population in terms of wealth. In other words, most Americans, Canadians, Australians, and Europeans - capitalist countries. If we the 10-15% stopped living such excessively lavish lives, the planet could sustain us all.