Desertification is caused by a combination of factors that change over time and vary by location. These factors include population pressure, socioeconomic policy factors, international trade and land use along with climate related processes such as drought. The major cause is the people putting too much pressure on delicate soils and ecosystems in ‘dryland’ areas. Another major factor is deforestation. Trees hold the soil together and help water the land by channeling rainwater into the soil. When they are chopped down, the soil is again eroded by the elements, and is unable to hold water. All of this leads to the acceleration of land degradation, poverty and migration.
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