The wall holding back a desert

Stretching 8,000 kilometres from the Atlantic coast of Senegal to the shores of Djibouti on the Red Sea, the Great Green Wall is one of the most ambitious environmental projects ever conceived — a living barrier of trees, vegetation, restored farmland, and grasslands designed to halt the advance of desertification across the Sahel, the fragile dryland region that borders the Sahara Desert to the south. Officially endorsed by the African Union in 2007, the initiative involves eleven nations and has attracted billions of dollars in international funding. Its goal is to restore 100 million hectares of degraded land by 2030.

The Sahel — home to 135 million people, a number expected to reach 330 million by 2050 — is under immense ecological pressure. Decades of drought, overgrazing, deforestation, and climate change have stripped the land of the vegetation that once held soil in place and retained water. As topsoil erodes and water tables fall, agricultural yields collapse, livelihoods disappear, and communities are pushed into displacement. Food insecurity, poverty, and conflict follow in the wake of land degradation with grim predictability. The Great Green Wall is conceived as a response to all of it — not just an environmental fix, but a social and economic lifeline.

By 2019, approximately 15 per cent of the wall had been completed, with notable progress in Senegal, Ethiopia, and Nigeria. Senegal had planted more than 11 million trees; Ethiopia reclaimed 15 million hectares of degraded land through a combination of tree planting and sustainable land management techniques; and Nigeria restored nearly 5 million hectares. Satellite imagery confirmed that in many targeted areas, the tide of desertification was being reversed. Crucially, the project evolved from the original idea of a literal wall of trees into a more sophisticated mosaic of land-use approaches — combining reforestation with sustainable agriculture, water conservation, and community-managed pastoralism.

The challenge ahead is enormous. Current restoration rates will need to accelerate dramatically to meet the 2030 target. Funding gaps, political instability in parts of the Sahel, and questions about the long-term survival rates of planted vegetation remain serious obstacles. But the Great Green Wall has already demonstrated something important: that restoration at continental scale is possible when governments, communities, and international partners work in concert. For the millions of people who live in its path, the wall is not an abstraction — it is, literally, a matter of survival.