An aerial view shows trees standing in an area that is part of the Great Green Wall of the Sahara and the Sahel on the outskirts of Walalde department in Senegal, July 11, 2021. The Green Wall initiative was launched in 2007 with aims to slow desertification across Africa's Sahel region, the arid belt south of the Sahara Desert, by planting a line of trees from Senegal to Djibouti. Picture taken with a drone. REUTERS/Zohra Bensemra SEARCH "BENSEMRA REFORESTATION" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES