After decades of drought, water is returning to the south of Sahara Desert as ancient farming techniques and the Great Green Wall breathe new life into the Sahel

For decades, the Sahel has symbolised environmental decline. Stretching nearly 5,900 kilometres across Africa from Senegal on the Atlantic coast to Sudan on the Red Sea, this semi-arid belt has endured recurring droughts, advancing desertification and repeated crop failures since the 1970s.

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