Straw checkerboard technique stabilizes soil and prevents sand from drifting.
Tree planting adds vegetation that absorbs water and holds the ground.
The initiative started about fifty years ago and continues today.
Researchers say the desert can still advance if the wall is not cared for.
The project, known as the Great Green Wall, creates a barrier of vegetation that reduces sand movement.
Scientists acknowledge the wall has slowed desert growth but warn that continued effort is essential.
Ongoing planting and maintenance are needed to protect the region long‑term.
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