What are the main causes of the expanding deserts?

Desert expansion or desertification is the phenomenon where the semi-arid and dry lands go on to become arid. This causes losses to wildlife and vegetation and also forces the human population to retreat towards other places for sustaining their lives. read more

Causes of desertification. Desertification is a natural process. Over the period of time lands change their behavior. Deserts become fit for life, and green plains grow into unproductive lands. Deserts also expand as a result of the climatic variations and the margins where deserts meet wetlands often blur in between the different seasons. read more

Climatic desiccation over the past 5000 years, andintense human hunting over the past 100 years, has obliterated mostof these fauna. Now, in vast portions of the Sahara, merely rock,sand and sparse vegetation are found. The remnant large mammalfauna is highly threatened by ongoing over-hunting. An alternativename of the Sahara is the Great Desert . read more