We are very much Nature. Possibly something independent of our own minds exist; we can never really know. Anything worth preserving, caring for, or caring about, is a product of the human mind. The meteor careening into the earth does not feel a moral quandary, but we do, and as such I agree that given our limited knowledge we should care. But we should also pay heed to how ignorant we are: we cannot possibly know how our present actions will play out in the future, the best we can do is try to be compassionate and take care of what we can. The rest is out of our control and hence our sphere of responsibility.
I'm not saying we aren't a product of Nature... I'm saying that the defining trait of man that sets us outside of our natural surroundings is our capability to use intellect, empathy, and morality to guide our decisions.
This is not a tool that "Nature" has in its toolbox. Nature has, natural selection. The random smatterings of dice throws that takes place trillions of times per day over the course of billions of years. The equivalent of throwing paint against the wall for a millennia to eventually recreate a Picasso.
This is not how humans work. Our efforts are efficient (at least more so than Nature's efforts), and when honed and optimized can be made into machines of frighteningly impressive efficiency.
There is certainly a difference between the creative and destructive processes of Man vs Nature.
