The livestock overgrazing of the Sahel resulted in desertification.
Explanation:
The Sahel is a region roughly stretching in an east to west direction. It separates the Sahara Desert on the north, and the steppes and savannas on the south. This region is semi-arid, being dominated by short grasses that are well adapted to prolonged periods of drought.
There a re people that live in this region, and thus there are human activities. Some of the prime human activities is the farming of livestock. The livestock needs grazing, and considering that it needs it constantly, an area that doesn't provide lot of food like the Sahel, is not able to sustain that. That contributes to overgrazing, which in turn contributes to desertification of the Sahel, so the Sahara Desert is gradually moving southwards.
The Sahel occupies territory in the countries:
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