The area of green was reducing in the last decades because of the profits that human being chased. Though the government has carried some policies to protect the forest and return part of the green, our environment has been still damaged badly. For example, the national treasure giant panda is dying out. One of the main factors is the lose of conservation areas. In the 1990s, people cut trees for making living, which destroyed the forest and giant panda lost their living places, so the number is falling down all the time. Spanish government advocated March 21st as the World Forest Day. They meant to call for the public to protect the forest. In deed, we need such a day to remind us of the importance of green. If we lost it, then not only animals but also human will die out.