Everywhere you look, you see evidence of man's existence. Buildings, billboards, shops, etc. But more and more, we're starting to see less of something else. Nature. Forests. Animals. As we continue to grow, their homes are getting smaller. And no matter how "green" we make ourselves, no matter how environmentally friendly we become, we will only continue to grow. And they will continue to shrink. There's no stopping it, if we continue living like we do. And there is but one solution: Leaving Earth.