Tried a lot of scientists, institutions and organizations to find a unified and comprehensive definition of desertification, and it remained for a short period is the subject of debate by the relevant United Nations bodies. However, the latest definition passed in the year (1994) under the United Nations Convention to Combat Desertification, and stipulates that the Desertification means land degradation in arid and semi-arid regions, and in arid regions and sub-humid which result from various factors, including climatic variations and human activities. Defines desertification as a decrease in the biological production of the land's capacity, or the deterioration of the fertility of land producing at the rate earned by conditions similar to weather the desert, so the desertification leads to lower production of plant life, and I have total desertified areas in the world amounted to about 46 million square kilometers for the Arab World of which about 13 million square kilometers, ...
Commentaires
Enregistrer un commentaire