With a quarter of the Earth’s land surface affected, the United Nations Convention to Combat Desertification regards desertification as a worldwide problem. Delegates from the 170-plus signatories to the Convention currently gathered in Nairobi have been briefed by ESA representatives and national partners on how satellites are being used to track desertification in Europe.
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http://www.esa.int/esaEO/SEMHLU3J2FE_environment_0.html