The Great Green Wall is an African-led initiative to restore 100 million hectares of degraded land across the full width of the continent, stretching 8,000 kilometers from Senegal on the Atlantic coast to Djibouti on the Horn of Africa. Launched in 2007 by the African Union, it targets the Sahel, the semi-arid belt south of the Sahara where drought, overgrazing, and climate change have stripped the land of vegetation and productivity. If completed, it would be the largest living structure on Earth.
Why the Sahel Needs It
The Sahel is one of the most climate-vulnerable regions on the planet. Temperatures there are rising faster than the global average, and the combination of erratic rainfall, population growth, and overuse of land has turned once-productive soil into barren ground. Millions of people in the region depend on small-scale farming and herding, and as the land degrades, food becomes scarcer, livelihoods disappear, and communities are forced to migrate or compete over what remains.
That competition has real consequences. Land and forest degradation acts as a conflict multiplier across the Sahel and Horn of Africa. As land productivity drops, intercommunal tensions rise, particularly over grazing rights and water access. The Great Green Wall was conceived as a direct response to this cycle: restore the land, and you address hunger, migration, and instability at their root.
Not Actually a Wall of Trees
The original concept was straightforward: plant a literal wall of trees across the continent to hold back the expanding desert. That idea has evolved significantly. The initiative now takes what the UN Food and Agriculture Organization describes as an “integrated ecosystem management approach,” aiming for a mosaic of different land uses rather than a single tree line. In practice, this means combining tree planting with natural vegetation regeneration, sustainable dryland farming, and water conservation measures tailored to each local landscape.
This shift matters because simply planting rows of trees in arid environments doesn’t work well on its own. The mosaic approach lets communities restore land in ways that match their actual needs, whether that’s rehabilitating grazing pastures, building rainwater harvesting systems, or reforesting degraded hillsides. The “wall” is better understood as a wide band of restored landscapes running across the continent.
The Countries Involved
Eleven nations sit along the original path of the wall: Senegal, Mauritania, Mali, Burkina Faso, Niger, Nigeria, Chad, Sudan, Eritrea, Ethiopia, and Djibouti. These founding members span the full width of the Sahel. Since the launch, the project has expanded to include additional countries in northern and western Africa, broadening the initiative’s geographic reach and the number of ecosystems involved.
Goals and Targets for 2030
The initiative has three headline targets, all set for 2030: restore 100 million hectares of degraded land, sequester 250 million tons of carbon, and create 10 million green jobs. Those green jobs include roles in tree nurseries, land restoration projects, sustainable agriculture, and related supply chains. The food security dimension is central, too. Restored land means more fertile soil, which means more reliable harvests for the millions of people in the Sahel who regularly go hungry.
The carbon target positions the wall as a meaningful climate tool. Restored forests and vegetation absorb carbon dioxide from the atmosphere, and 250 million tons would represent a significant contribution from a region that has historically produced very little of the world’s emissions but suffers disproportionately from their effects.
Funding and the 2021 Accelerator
Money has been one of the initiative’s persistent challenges. A turning point came in January 2021, when French President Emmanuel Macron and other world leaders launched the Great Green Wall Accelerator at the One Planet Summit, pledging $14.3 billion in new funding. Since then, total commitments from multilateral and bilateral organizations have climbed past $19 billion. These funds flow through a mix of international development banks, bilateral aid programs, and climate finance mechanisms, supporting projects across all eleven core countries.
Progress Has Been Slow
Despite the ambitious funding pledges, progress on the ground has lagged well behind the 2030 targets. The most telling evidence comes from Senegal, widely considered one of the most committed countries in the initiative. Researchers found that only one out of 36 areas planted with new trees was actually greener than it would have been without intervention. The primary culprits: seedlings dying during periods of low rainfall, and young trees being trampled or eaten by cattle in areas without fencing.
This pattern repeats across the Sahel. Planting trees is relatively straightforward. Keeping them alive in harsh, semi-arid conditions with limited infrastructure for maintenance and protection is far harder. Without fencing, irrigation support, or sustained community involvement in the years after planting, survival rates remain low.
Conflict Complicates Everything
Several of the wall’s core countries sit in some of Africa’s most unstable zones. Parts of Mali, Burkina Faso, Niger, Nigeria, and Chad face ongoing armed conflict involving militant groups, intercommunal violence, and military coups. This instability doesn’t just make restoration work dangerous for communities and aid workers. Conflict directly destroys landscapes through fires and military operations, and it collapses the local land management systems that restored areas depend on for survival.
The relationship runs in both directions. Desertification and land degradation fuel the very conflicts that undermine restoration efforts, creating a feedback loop that’s difficult to break. The UN has identified the Great Green Wall as a strategic platform for addressing this cycle, arguing that land restoration can serve as a form of peacebuilding by reducing the resource scarcity that drives violence. But in the near term, insecurity in key regions remains one of the biggest obstacles to physical progress.
What the Wall Looks Like on the Ground
In the places where restoration is working, the Great Green Wall doesn’t look like a forest. It looks like farmland with more trees scattered through it, like village plots surrounded by regenerating shrubland, like stone barriers built along slopes to slow rainwater runoff so it soaks into the soil instead of washing it away. Communities use techniques like farmer-managed natural regeneration, where existing root systems and stumps are protected and encouraged to regrow rather than clearing land for new plantings.
These smaller, community-driven approaches have generally shown better results than large-scale planting campaigns. They cost less, they work with species already adapted to local conditions, and they give communities a direct stake in maintaining the results. The challenge is scaling them across a band of land that spans an entire continent, through countries with very different governance structures, levels of stability, and access to resources.