THE DESERTIFICATION is the persistent degradation of ecosystems of dry areas. She threatens the livelihood of populations among the poorest and the most vulnerable of the planet. The desertification is largely the result(profit) of a not long-lasting(sustainable) use of rare resources. What options does he(it) exist to avoid or invert the process of desertification and his(its) negative impacts? What the desertification? The desertification indicates(appoints) the persistent degradation of ecosystems of dry areas by the climatic variations and the human activities. Sheltering a third(third party) of the human population in 2000, dry areas cover near half of the earth's surface of the planet. The desertification has a negative impact on the livelihood of million people worldwide who depend on benefactions which the ecosystems of dry areas can them get. In dry areas, rarity of the limit(borderline) water the agricultural production of harvests, feed, wood as well as other services(departments) which the ecosystems supply to the men(people). Dry areas are consequently very vulnerable in the increasing human pressures as well as in the variability of the climate, especially in the sub-Saharan dry areas and of Central Asia. About 10 - 20 %des dry areas are already degraded and the current(in class) desertification threatens the poorest populations of the world as well as the perspectives of decrease of the poverty. That is why the desertification is one of the biggest environmental challenges at the moment and establish(constitute) a major obstacle to the satisfaction of the human basic needs in dry areas. The desertification affects(touches) the most vulnerable populations the world.Le bois, source principale de l’énergie domestique
Les études réalisées en 1990 ont montré que la ville de Niamey consommait près de 133 000 tonnes de bois par an. En 1994, l’accroissement démographique a entraîné une augmentation de ce besoin à 150 000 tonnes. Cette tendance continue