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Melea, Kanem Region, Chad.

Near the village of Melea people irrigate seedlings on the dried lake bed of Lake Chad. Lake Chad, which spanned 9,652sqm in 1963, has shrunk by 90 per cent in recent decades. Climate change is to blame, with population growth and unplanned irrigation also contributing to what the UN calls an 'ecological disaster'. The Great Green Wall is a project spanning 8,000km of Africa from coast to coast encompassing 20 countries. By 2030 the ambition is to restore 100m hectares of degraded land and bring security to one of the most impoverished regions on earth.