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Desertification - – Medicines resins Drylands often...

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Click to edit Master subtitle style 2/24/10 What is Desertificati …the process whereby productive land becomes so seriously eroded that any remaining soil loses nutrients
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2/24/10 The Human These include: poverty & over- population, To sustain themselves people: destroy forest belts, practice poor irrigation , use inappropriate agricultural methods Human acti vity often plays a major role in degrading land.
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2/24/10 Some Effects Wind erosion contributes to more frequent /intense hurricanes Stress on the world’s food-producing capacity air pollution
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2/24/10 Growing Problem Land degradation… increasing at a high rate. The UN Environment Program: estimates 250 million people are directly affected more than one billion are at risk. Drylands cover
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2/24/10 Dry lands… actually quite the opposite . They are a vital source of biological diversity . Medicines, resins,
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Unformatted text preview: . – Medicines, resins, Drylands often conjure up images of unproductive land 2/24/10 Food Grains • Many of the most important food grains originate in drylands: wheat, barley, millet, & sorghum • Wildlife: (e.g.) large mammals and migratory 2/24/10 Canada’s Dryland • Only 5 to 7% of Canada’s land is suitable for agriculture , • and nearly 75% of it sits in the 2/24/10 Costs of Desertifica tion • United Nations estimates that desertification costs US$42 billion a year, • annual cost to prevent land degradation is estimated at only 2/24/10 Consequences of • It exacerbates poverty and political instability • Many suffer from water scarcity and famine • Children (especially girls) cannot attend school because they're forced to walk long distances...
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