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The second main cause is climate change.Climate change is any significant long-term change in the“average weather” of a given region.Climate change is different from other causes,because other causes,such as deforestation and overcultivation,are human causes.Climate is physical cause.One example of climate change,lower precipitation,for example,can leads to desertification.In Sahel from 1970 to 1990,the rainfall in these years were way below average,causing Sahel to experience a severe drought from 1976 to 1986.When climate changes,rainfall is reduced and there will be a drought.When droughts occur and leave insufficient vegetation to bind the soil together,wind and water can easily cause large-scale erosions.The topsoil is removed due to dust storms.Even when rain eventually falls,rapid run-off will cause many a problem.Because the land can’t infiltrate rain anymore,it will leads to the desertification.