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In the Sahel, in Africa, rain only falls within four months of the year. Moctar Sacande explains the techniques that are employed to increase humidity in the places seeds are sown. By planting the right species in these catchment areas, they have a greater chance of surviving the dry season. (Image: Villagers in Kolya Alfa sowing the seeds on the reinvigorated soils along the line of the Great Green Wall, Credit: Â鶹Éç.)