Absolutely correct.  Human activity is natural and mother nature does not need our protection, she will be just fine no matter what we do.

However, she doesn't give a whit about us.  I want to protect and maintain our environment for our sakes.  The current conditions are pretty comfy for humans, we should try to keep it that way and not foul our own nest too much.

On a side note, isn't it weird that so many self-proclaimed "conservatives" are not interested in conservation?  Just a little food for thought.