Sahel is an area in Africa that has lost a huge area of productive land in the last century due to excessive human activities and climate change. This area is a blaring example of .

Explanation

The Sahel region, lying just south of the Sahara Desert, has experienced severe degradation of its semi-arid land into barren desert. This environmental crisis is a textbook example of desertification driven by overgrazing, deforestation, and prolonged droughts.