La desertificazione: un problema ambientale e sociale. L’esempio del lago Ciad

The word desertification reminds immediately the portrait of a desert, althoug deserts are natural ecosystems which grow and and pull back during centuries. In this arcticle, for first, are shown several definitions used to describe the desertification, then are explained some methodological ties and knowledge fundamentals to observe the phenomenon and its backgorund; finally is given an practical example of one of the most harmful problems for central Africa, the gradual disappearence of the idorgraphic basin of lake Chad, that is responsible of most of the water of four wide Countries, in one of the most dry region of the World.