Almost without exception, those humans (mostly astronauts), say the experience of seeing the Earth from outer space profoundly changes who they are as a person. It makes the Earth feel more precious, they say, our human grievances seem pettier, and the environmental damages we are causing to the planet, graver. Today is World Environment Day, or what the United Nation’s calls the "people’s day" for doing something to take care of the Earth. But in order for us to take care of the Earth, we first have to remember why the Earth matters. And what better way to do so than a gallery of stunning images of the Earth from the outside combined with words that encapsulate the perspective of those who have had the fortune to see the planet first hand from this unique perspective. Enjoy.