Lec_18_Degradation of Arid Lands_02_27_09

Lec_18_Degradation of Arid Lands_02_27_09 - Degradation of...

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Degradation of Arid Lands: Desertification
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Man strides over the earth and deserts follow in his footprints. Ancient Proverb
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Definition: A process of environmental degradation by which productive land is made non-productive and desert-like
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The white man has reversed the slow work of nature that had been going on for millenia. Thus have come deserts, so long checked and held in restraint, to break their bonds. At every step the girdle of green about the desert has been forced to give way and the desert itself allowed to expand. If man destroys the balance and equilibrium demanded by nature, he must take the consequences. Paul Sears, 1935
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Statistics: Currently 35% of the world’s land surface is at risk. ..each year 21 million hectares is reduced to near complete uselessness. -United Nations Environmental Program (UNEP)
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an area the size of New York State every decade. Smith, 1986
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This note was uploaded on 03/29/2009 for the course NTRES 2010 taught by Professor Fahey,tj during the Spring '09 term at Cornell University (Engineering School).

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Lec_18_Degradation of Arid Lands_02_27_09 - Degradation of...

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