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Spreading routes of locusts in 2004
Underground water is the major water source in the Sahel
The shrinking of Lake Chad from 1963 to 2007
World birth rates in 2009
Distribution of population living on less than US$1.25 a day, 2006-2007
Growing coffee can get a higher income
Many people leave their homes because of racial conflicts
Agricultural activities of Sudan are often affected by wars
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