Atlas Obscura has an article on projects in Senegal that are hoping to stop the spread of the desert along the southern edge of the Sahara.
The garden is the latest iteration of the pro
ject known as The Great Green Wall, first envisioned as a viridescent belt squiggling thousands of miles across the Sahel region, from Senegal to Djibouti. Launched in 2007 by the African Union with backing from the European Union, World Bank, and the United Nations, the project was initially meant to help stave off desertification by stymying the Sahara as it wandered south. ... The drivers of desertification include climate variability and climate change, overgrazing, the construction of river dams, and conflicts that displace people and spur shifts in land use. Long droughts can leave fertile soil vulnerable, and winds and rains can whisk it away. “Deforestation can accelerate the process, because trees serve as windbreaks,” Okolie says. That’s where the Great Green Wall concept came in. The initial plan emphasized trees as an anchor for soil and a buffer against the encroaching sand. Some elements of the idea made sense, says Geert Sterk, a geoscientist at Utrecht University who studies land degradation. “Tree and shrub roots hold soil, [and] the canopies trap raindrops before reaching the soil surface and reduce strong winds,” curbing erosion by wind and the region’s relatively rare but fierce rain,
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it is not just a problem in Africa: China worries about the Gobi.
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