It was suggested that our planet changing is unavoidable. Ice ages come and go while wiping out entire species and most of the life on Earth. Large asteroids will fall and decimate a whole continent perhaps. Theses things have been happening to our planet for eons and it's most likely safe to say that we view this as a natural course of the planet existence, things will die out and new life will take it's place. Thus who is to say that what is currently happening to our planet (global warming, glacial melting, polluted air) is wrong and unnatural. Because we caused it? Well it would be retorted with who says we're not a natural course as well? Human beings are so used to thinking of them selves as out side of the natural sphere, but the truth is that we are not. Sure, our species seem to behave and operate quite differently then the other living things on our planet, but that doesn't mean we're not just an animal like the rest of them.
But we might say that we forced the change by choice, the other great natural disasters where made unconsciously. This still doesn't refute the fact that we are also part of the natural course of the planet. Thinking and choosing is part of our nature, thus that is the type of natural forces we exert. Plus who says that our effects will generate that much of a fire in the woods in the grand scheme of things. To the Earth our existence is but one key on the large piano of it's life, the Earth is highly adaptive. So our impact may take a couple eons to dissipate fully, either way it will happen. The only real threat here is to our selves and our species' survival. That is the concept that we really have to realize. The Earth will fix it self, but it probably wont be fast enough to save us. The only one's we're harming (other then the other life forms that currently inhabit the planet with us) is our selves. When the Earth can't sustain us, then what? Space, with it's lack of fertile land for food, and nomadic way of life?
