UN News: Stretching from Dakar to Djibouti, a United Nations-backed programme dubbed the 'Great Green Wall` brings together 11 countries to plant trees across Africa to literally hold back the Sahara desert with a swathe of greenery, lessen the effects of desertification and improve the lives and livelihoods of communities. The Wall, an initiative spearheaded by African heads of State, will stretch about 7,000 kilometres from Senegal in the west to Djibouti in the east and will be about 15 kilometres wide...