Africa's proposed 4,000-mile wall of trees stretching from Senegal to Djibouti is designed to stop encroaching desertification.
Seasons are shifting across the region. In Senegal the rainy season used to start in July or August but now it doesn't start until September. Decreased rain - along with over grazing of land - is causing an increase in deserts across the Sahel. Roughly 40 per cent of Africa is now affected by desertification and according to the UN, two-thirds of Africa's arable land could be lost by 2025 if this trend continues.
Senegal is one of 11 countries in the Sahel region of Africa looking towards the same solution to the desertification problem: The Great Green Wall. The goal of the project is to plant a wall of trees, 4,300 miles long and 9 miles wide, across the African continent, from Senegal to Djibouti. African leaders hope the trees will trap the sands of the Sahara and halt the advance of the desert.