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I_am_the_Jukebox t1_ixfxfd2 wrote

It's not so much that Earth is unsustainable. Humanity on Earth is unsustainable with the way we're going.

For so long we were able to the immediate effects of our actions weren't present. Well, we've reaped thousands of years of that, with the bulk of the damage coming from the last 100ish years. Unless we take drastic steps, we'll wreck things here to the point where survival of the species is extremely uncertain. Some species will survive, just like they survived the catastrophic event that killed the dinos. But the bulk of life, including humans, will likely perish.