We should be much more worried about population collapse
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Humans should be striving to reach a population level which is sustainable for all of the years of the future.
If that means reducing population levels from the current unsustainable figure, so be it.
If humans don't do it voluntarily, Old Ma Nature will do it for us. No ifs, buts, or maybes.
Population collapse is not necessary bad.
The nature will find a proper equilibrium, shake off the metastatic human expansion, heal Earth's surface wounds, digest the plastic.
Nature is not much consolation without humans. If you value it, it's because you're human and have value judgements, not because the cold indiferrent universe puts any value to it. The universe is gonna pull the lights out for the sun, and the planet before that anyway.
In fact, "better without humanity" is the ultimate human sentiment. No animal would be so absurd!
How do you get up in the day and do anything? What motivates you? It seems you think humanity would be better off not existing. Why do you exist?
I'd like to understand your state of mind.