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The planet is fine. The PEOPLE are fucked. Difference.
(i.imgflip.com)
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Normally I'd totally agree with you but the more I see how badly we've fucked everything (google AMOC and water temps) the more I worry about runaway effects that continue far after we've been deleted entirely from the ecosystem (and most of the ecosystem to boot) - there's only so much CO2 you can pump into a system before warming becomes rapidly self sustaining - see Venus.
As far as we know, the problem with Venus is that it never developed a cycle of aerobic and anaerobic life forms. Even if we pump the atmosphere full of CO2, some photosyntethising life forms will still remain.