Humans at the atomic level is the same as nature itself. Human is nature. We are intertwined with everything around is even if we choose to reject such ideas. Our action then, almost always directly impact the habitat around us. Global warming is an issue like you mentioned. It is thus up to us to not only cease our destructive behavior but to educated and guide the generations to come to understand their impact on this planet.
RE: Nature or Natural - A Human Perception