See the $36 billion Great Green Wall in Africa that's an attempt to hold back desertification

Zohra Bensemra/Reuters

• The Great Green Wall is a project to restore degraded land in nearly two dozen African countries.
• Deforestation, agricultural expansion, and drought have caused desertification across the continent.
• The $36-billion-plus project aims to generate 10 million jobs and sequester tons of carbon by 2030.

Over the past several decades...