Somecountries are building a great wall of trees across Africa. It is called theGreat Green Wall. The aim is to bring life to the dry lands and help to fightthe bad environment.
Thewall is about 8,000 kilometers long and about 15 kilometers wide. It coversfrom Senegal in the west to Djibouti in the east, on the south of the SaharaDesert (撒哈拉沙漠). So far, Senegal hasmade the best progress by planting about 11,000,000 trees.
Manyyears ago, there were few trees in that area and the winds used to be verystrong. It was harmful to the fields. Also, there was little rain, so fewplants could grow and many people went hungry. Since the tree planting projectstarted, the trees have provided food for the local people and increased thewetness (湿度) of the air. Little bylittle, there appeared green fields for people to grow plants.
Theproject which began in 2007 is supposed to cost a total of 8,000,000,000dollars.Many countries are trying their best to help to continue the planting. So wewill be able to see the whole green wall across Africa in the near future!
