Overpopulation is not the cause of global warming. Most carbon is produced through the endless consumption of the economies of Europe and the US. It is not from places with high populations.
These talking points must be fought whenever and wherever they arise.
The green movement worldwide is completely compromised to serve the agenda of economic elites. In many cases their work actually increases the dependence on hydrocarbons (anti-nuclear movement, also there is a strong astroturf movement against power dams in the developing world). Politically they are married to liberalism’s worst excesses (imperialism and censorship of dissenting ideologies). It’s a total shitshow.