When less is more. What can you do with 5 yuan? Not a lot, you may think. Well, if buying a bag of candies or cookies doesn't appeal to you, how about buying a tree instead? Yes, a tree along the banks of the Yellow River to be exact. Every year, approximately 1.6 billion tons of soil flows into the Yellow River, China's second longest river. The soil contains materials to keep the natural balance of the area. Over time, a lot of soil has been removed, which has caused serious erosion of the land along the River. In some areas in Shanxi Province, this has destroyed almost all the land, and has forced many local farmers to move to other areas. It is a huge job to control Yellow River erosion. Many people believe this kind of work is best done by government or international organizations. You may agree with this point of view. If so, it is time for you to think again.