Overpopulation and desertification result in a shortage of food and water. Nomads from the north have had to move their livestock to the south where non-Arab farmers live. This land cannot support all of these people.
Check this article for more information.
http://en.wikipedia.org/wiki/Darfur_conflict
Why are drought desertification and overpopulation among the causes for the crisis/conflict in darfur?
What is the connection of genocide and ethnic cleansing to darfur?
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what are the snswers