التصحر وعلاقته بالمشكلات البيئية

Abstract

The “Desert”is considered a climatic expression that refers to the regions which are characterized by rarity of the rain especially if they are less than 10 ml year and the increasing of the temperature might increase its annual average of 30 m, so one of the characteristics of these regions is the rarity of its plant cover and if it occurs it appears in som thorn plants that bear the strong dryness. The desertification or what is called the desert crawling means the decline of the agriculthral lands that produce the crops and turn them into unproductive barren lands because of natural and human factors and the natural (climatic) factor is at the beginning which appears in the increasing of the temperature and lack or rarity of the rain and consequently these regions began to acquire the climatic features of the desert regions. Thus,then leads to disregard broad areas of agricultural lands on the earth planet out of the economical sectors and therefore the possibility of happening disasrers and international economical crises which may become one of its results the happening of changes of the international relationships in the world to the directions which may lead to the struggles and wars. There are many international conference held in deferent world capitals to deal or to solve the problems of desertification . Such as Nairobi in 1977 , Rio de janeriro in 1922 , Kyoto in 1977 , Buenos Aires in 1998 , Bali in 2007, Copen Hagen in 2009, and Van cover in 2013 .