That's the thing,..
When people talk about preserving nature or saving the planet, they aren't talking about saving "nature" as in something separate from human beings, they are talking about saving ourselves.
We are dependant on nature for our survival. We think we're not because we raise our animals in man made shelters, but the animals are still "nature".
We also need water to survive, and perish quickly if none can be had.
Nature can survive without us, but we can not survive without it.
So when we talk about preserving it, we talk about preserving our own habitat, our own needs, our own eco system.
Me, I think we're headed head first into a pile of mess, and sooner or later we, ourselves, will alter the balance of the planet's own systems to a degree which makes the planet unable to support large populations of human life.
But 'till then, I'm just gonna carry on living, as worrying about tomorrows disaster doesn't change that we still got to make dinner today.