When the Great Green Wall initiative began in 2007, it was just a vision of a big, beautiful wall of greenery spanning the width of Africa to keep the Sahara Desert from encroaching on the rest of the continent. Despite years of successes and failures, celebration and criticism, we can see the progress being made as an inspiring example of how local and global collaboration can help counter the effects of climate change.
Just a few years ago, the Sahel region at the northern edge of Senegal was a “barren wasteland” where nothing had grown for 40 years. But the United Nations World Food Programme (WFP) and local villagers teamed up to regreen the area, bringing back agriculture, improving the economy of the people who live there, and preventing the climate migration that desertification ultimately leads to.
One of the keys to this particular regreening project is using long-forgotten techniques for harvesting water. When soil is crusted and sunbaked and hard as cement, rainwater doesn’t penetrate and it’s impossible for plants to take root. The solution? Half-moon shaped ditches dug in such a way that water flows into them on the straight side with an embankment built on the rounded side to hold the water in. Each half moon is 4 meters in diameter and takes about a day for one person to dig.
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