It is about how we have separated ourselves from what we call nature and those we call animals. We are, indeed, natural beings; we are animals. We live, some of us reproduce, and we die. But Earth Day is about how we, the humans, have become the stewards of this tiny world, whether we like it or not. We have the power to destroy entire civilizations, wipe out cultures and societies—human and otherwise. We have the power to tip the course of history down the path of destruction or the path of unity. As the stewards of our blue world, we have a responsibility to ourselves to maintain the global environment and lessen our adverse impact on it. It is important to remember that we are not so powerful that we could destroy the world. The world will go on after we are nothing more than a memory. Perhaps in the distant future the descendants of today’s whales will sing of the hunters that once prowled the oceans. Maybe we will have wiped ourselves out through nuclear war or a genetically engineered virus, maybe we will simply have left, journeyed to the stars, or maybe we will have evolved into something new. Earth Day is about the fact that now, in this moment, we are a part of the planet Earth. It is not simply where we live, it is what we are. We owe it to ourselves to ensure the Earth is healthy and habitable for us and for all of the other species that make up the cornucopia of life on this tiny speck in the backwater reaches of a lonely galaxy.