Green tide – The Great Green Wall was conceived as a 7,700-kilometer tree belt stretching the length of the Sahara Desert. Around 15% of the Wall has already been planted, largely in Senegal, where four million hectares have reportedly been restored.
Shifting sand – The Wall was conceived in response to the growing crisis of desertification in the Sahel region on the southern side of the Sahara desert, which causes drought, famine and poverty.
Desert diagnosis – But scientists claim that the Sahara is not advancing, and that the causes of land degradation will not be solved by planting trees that rarely survive in arid land.
Grassroots recovery – Niger is among the poorest countries in the world but it has achieved spectacular success through farmer managed natural regeneration methods.
Over five million hectares of land have been restored, and around 200 million trees, which can provide food for millions of people.