Environmentalist Alex Johnson makes a great suggestion: our definition of "natural" needs a good queering:

"As it would happen, I’m queer. What I mean is this: A) I am a man attracted to men. B) Popular culture has told me that men who are attracted to men are unnatural, and so C) if my culture is right, then I am unnatural. But D) I don’t feel unnatural at all. In fact, the love I share with another man is one of the most comfortable, honest, real feelings I have ever felt. And so E) I can’t help but believe that Nature, and the corresponding definition of 'natural,' betray reality. From my end of the rainbow, this thing we call Nature is in need of a good queering."

Here's a link to his article.