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I'm going to have to disagree with you on this one Denny. The Nazis conducted careful experiments on just exactly how much arsenic it takes to kill someone. Like you've pointed out we don't have a duplicate earth that is sans humans to conduct experiments on.
But we both agree that there is absolutely nothing that we silly humans can do to this planet that would make our existence on it more difficult. We're just passengers on this big blue marble. Everything is beyond our control.
We can pollute the planet, sure. But CO2 isn't an example of it.


