Most people can easily recognize an enviornment that has been "hurt" and have no need of an academic definition that quibbles over whether or not an environment that we subjectively feel is degraded is still technically an "environment" or not. I mean, come on!
In my opinion, you're using adjectives that carry a negative connotation for a phenomenon that is a neutral occurrence. How can something that is an "environment," with all the multitude of different meanings that word has, ever be "hurt?" It can only be changed. It could be changed to consist of less living things (usually by other living things), it could be changed in color or atmospheric composition, or it could be changed in such a way that life (as we know it, obviously) is extinguished, and thus it would cease to be an ecosystem.

This is a thoroughly natural process that has always gone on. Dinosaurs may have been killed by a vast geological event, or a particular bacterium, or maybe they all tripped and hit their head. Whatever happened, they're all dead and no one wastes tears over them. All things are transitory, and I firmly believe that the human race will eventually (or momentarily) cause our environment to be so altered that the physical bodies of humans and other life-forms on earth can no longer live. I don't view this as the "destruction" of the environment, merely as our species naturally running it's course. Our planet running it's natural course.

Even if the earth became a burned-out shell where no earthly life could live for 100 trillion years, that would be no better or worse than the way it is now. Thinking of it, I can't think of anything that carries connotation of "good" or "bad" that actually persists through time but the concept of "beauty." I believe that beauty can be found in anything, and so as long as know that beauty will persist SOMEWHERE even if I'm not around to gawk at it, that's good enough for me.

An also, the "possibility" of life arising from non-life is more of a "certainty." God is something that has never been empirically observed or proven. The VERY observable presence of life ALL around us and the logical assumption that it developed from non-life (since both are composed of the same thing) pretty much proves that not only has life spawned from non-life, but that there's no reason it couldn't happen again, maybe in a way that is utterly unrecognizable to our eyes as life.