A proposed “Great Green Wall” of trees and other vegetation planted along the southern fringe of the Sahara Desert might have a profound effect on the climate of northern Africa.
launched in 2007 and is now roughly 15 percent complete. Proponents hope the completed tree line, which will extend from Senegal to Djibouti, will not only hold back the desert from expanding southward, but also bring improved food security and millions of jobs to the region.
To investigate those possible impacts, Pausata created high-resolution computer simulations of future global warming, both with and without a simulated wall of plants along the Sahel. Against the backdrop of global warming, the Great Green Wall would decrease average summertime temperatures in most of the Sahel by as much as 1.5 degrees Celsius.
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