Acacia trees help combat desertification

In Africa’s Sahel region people are trying to push back the frontiers of the Sahara desert – or at least halt its continuing expansion into what used to be arable lands. Deforestation and ensuing soil erosion are a major cause for desertification. Replanting trees may stem the trend – and help local inhabitants earn their living. One example is this project initiated by the Food & Agriculture Organisation of the UN (FAO):