desertification

• desertification: the spreading out of the desert
• case study: sahel region in northern africa
• causes (in sahel): 1. drought, lack rain water causes drought and climate change disrupts rain patterns. 2. overgrazing, cattle numbers sometimes is too big for the amount of grass available and soil becomes exhausted, becomes infertile. 3. soil erosion, topsoil lost from wind and rain, dry and bare soil will be blown away by rain and wind