books the degree of desertification alone
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# Studying the phenomenon of desertification
# desertification in Africa
# Desertification in the Arab world
# desertification problem
# desertification in Algeria
# desertification in Saudi Arabia
# desertification in Morocco
# desertification in Lebanon
# desertification in Egypt
# How to protect the soil from desertification
# Other ways to protect the soil from desertification
# How does desertification happen?
# Solutions to the problem of desertification
# How to combat desertification
# Study indicators of desertification
# desertification risks
# The National Program to Combat Desertification
# Strategies to combat desertification
# desertification and drought
# Increased desertification and economic incentives
