Africa's plan for an 8,000-kilometer wall of trees against the Sahara kept dying in the ground for years, and the approach that finally worked came from farmers in Niger who regrew 200 million trees without planting a single one, because they protected what was already trying to grow - ScienceBlog.com https://scienceblog.com/b-africas-plan-for-an-8000-kilometer-wall-of-trees-against-the-sahara-kept-dying-in-the-ground-for-years-and-the-approach-that-finally-worked-came-from-farmers-in-niger-who-regrew-200-million-trees-wi/