What is Africa’s “Great Green Wall”?

Africa’s “Great Green Wall” initiative is a proposed 8,000-kilometer line of trees meant to hold back the Sahara from expanding southward.

The project was launched in 2007 by the African Union, and aims to plant 100 million hectares of trees along the Sahel, the semiarid zone lining the desert’s southern edge, by 2030.

11 countries selected as intervention zones for the Great Green Wall are: Burkina Faso, Chad, Djibouti, Eritrea, Ethiopia, Mali, Mauritania, Niger, Nigeria, Senegal, and Sudan.

The project is now roughly 15 percent complete.

According to simulations made recently by scientists, the completed tree line could as much as double rainfall within the Sahel and would also decrease average summer temperatures throughout much of northern Africa and into the Mediterranean. At the same time the study found that temperatures in the hottest parts of the desert would become even hotter.

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