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What does the cause matter? The point is that life managed to hang on each and every time.
My point is that the environment doesn’t really need to be protected from humans in the way Kalhoun seems to think. I’m not really all that concerned about mass extinction as I don’t see it as a threat to human life. I can get worked up over air and water pollution as well as overfishing but I imagine there are a lot of species that could go extinct without any effect on the quality of our lives.
Marc