Earth is our mother. Without earth ,without life.It provides us with enough water, food, sunshine, mineral and so on. I can even say we can only live in the earth . There may isn't any celestial body like earth that our human can live. But there is only one earth in the world, so please protect it, protect our "mother", we can do it from little things such as saving water, planting trees and so on. So please do it right now, for ourselfs, for our younger generation.