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.
toxic individualism can at best make short term alliances to persecute ‘others’, but they will always collapse into infighting as every little shithead can’t help but see their neighbors as competitors and threats. This is basically where the western world and liberalism are at with climate change–they’ll shit on the vulnerable for a while to maintain their own standards of living and then when things get too bad for that to work anymore, complete collapse of anything remotely resembling civil society.