Desertification
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Desertification is the gradual change of land into desert. Over the centuries, deserts have expanded and contracted with natural variation in climate. In the past, this has not been an issue, but as populations spread into more marginal land, and as nomadic and semi-nomadic peoples are becoming more settled, pressures on the land increase, creating the conditions for marginally productive land to be turned into deserts. Human-induced climate change is also playing a role in the process of desertification.
Desertification: Wikipedia | USGS | UN-FAO | Greenfacts
United Nations Convention to Combat Desertification
World Desertification Day puts spotlight on neglected crisis


Desertification: A threat to the Sahel
Tunisia's arid regions: how can desertification control and development be reconciled?
Global Desertification Vulnerabilityhttp://soils.usda.gov/use/worldsoils/mapindex/desert.html

Desertification is the gradual change of land into desert. Over the centuries, deserts have expanded and contracted with natural variation in climate. In the past, this has not been an issue, but as populations spread into more marginal land, and as nomadic and semi-nomadic peoples are becoming more settled, pressures on the land increase, creating the conditions for marginally productive land to be turned into deserts. Human-induced climate change is also playing a role in the process of desertification.

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