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None of those things are responsive to the question: What existed 1000 years ago that humanity could use to make the planet uninhabitable?

If you don't have an answer to the actual question at hand, it's okay to say so.




Human kind is not able to exterminate itself full stop. It couldn't then, it can't now.


Okay. Answering different questions is one way to signal you don't have an answer to the actual question. We can accept that and close this thread. Thank you for participating.




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