If anyone's read, "House of the Scorpion," you'll see the kinds of things cloning can be used for. I think how ethical it is depends a lot on what it's used for.
If you're cloning a human being, they're still human beings, and should be treated as such. Cloning an organ or a body part however, is much different.
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I read that. Good book, when I was eleven. The thing is, you can't clone just organs. Unless years/decades of Stem cell research is done first.