In fact, it is you who have the most important role to play in stopping Yellow River erosion. Did you know the importance of your 5 yuan? For a start, it can buy you a tree, which will help make soil stay on the land. On land with rich soil, local farmers can grow crops to make a living. With the money they earn from their crops, farmers buy goods or services. This helps to develop local economies. Still puzzled how your 5 yuan can have so much effect? Well, just take a look at the fact below. Since 1997, a tree-planting progamme has changed the Jiuchengong Valley in Inner Mongolia into a green homeland. Visitors from all over the world now come to admire this great achievement. What is more, the success of the programme has greatly improved the lives of the local people. Just think: all this started with 5 yuan! So when you have 5 yuan in your pocket next time, think twice about how to use the money. Remember you can use it to buy a tree and create a green future for our motherland, our people and yourself.