Many places in Africa have desertification problems. Desertification is the transformation of fertile land into desert. In Africa, the desert is expanding by at least three miles every year. Desertification is caused by human errors, drought, overgrazing, overfarming, deforestation, and over irrigation. Animals' habitats are destroyed, the animals that eat plants would die off, and then the whole food chain would fall apart. Humans can no longer farm because they have over-farmed their land and it is now infertile, causing a lack of food. Droughts would ensue, and conditions would get tough. Many humans and animals would end up dying.