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Imagine a green wall - 15 kilometres wide, and up to 8,000 kilometres long. Imagine it just south of the Sahara, from Djibouti in the Horn of Africa in the east, all the way across the continent to Dakar, Senegal, in the west. The building of this pan-African Great Green African Wall (GGW) was just approved by an international summit taking place this week in the former German capital Bonn.