We can support the current population, it's just not profitable or popular to do so.

If your solution ignores the nature of human psychology it's not a solution, it's a quixotic quest.

Our current standard of living is mostly predicated on offshoring the suffering and waste to the global South, but even that could be comfortably leveled off if we weren't living under Capitalism.

Yes, and as their standard of living rises to meet ours, the whole human output becomes increasingly unsustainable.

We don't need large AI farms, we need empathy. The techbros will not save us.

There is a more plausible path for neural networks to be involved in climate change solutions then their is for you to replace capitalism.