How do people modify the savanna?

Savanna areas are popular with nomads (people who move from place to place) e.g. Massai tribe of Kenya. This method of farming can be beneficial to the environment. Grazing animals are not kept in just one area. They are moved from place to place, allowing vegetation to recover. However, in times of serious drought animals can remove the scarce vegetation cover. This leaves the soil prone to erosion. Desertification (land turning to desert) occurs in extreme cases.