Nature to us what water is to fish.Yet we do not always realize it until it is too late.With the development of modern technology,there are more and more people on the earth and fewer and fewer resources left.What is worse,pollution is getting more and more serious and the climate is becoming warmer and warmer.So we must do something to protect not only our next generation but also ourselves. Little things really count. Turning off unused appliances actully saves a lot of energy.Morever ,we can plant trees so that we will enjoy the shade as well as our next generation.If we do something to nature,it will do more to us.