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The Great Green Wall was officially launched by the African Union in 2007. It aims to fight desertification by creating a huge strip of vegetation across Africa, from Dakar in the west to Djibouti in the east. The Wall would be eventually more than 8,000 kilometres long, crossing 11 African countries. Since 2007, the project has evolved, with the goal of creating millions of jobs. But critics say progress has stalled. Our correspondents report from Senegal and Nigeria.