Oh, and if morality was based on nature in the sense of genetic advantage and disadvantage only, we wouldn't have to think about it, much less argue about it. It would just be built-in, like in animals.
Also, nature in the sense of the physical world doesn't really care what we do. It's not like in Avatar. We can be gone tomorrow and no other physical think would notice. Well, my dog and cat would, but only because I feed them.
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