Desertifikation, Desertation und Dürren. Ursachen und Wirkungen von Problemen der Trockenräume der Erde: Die Auswirkungen des globalen Klimawandels au
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Studienarbeit aus dem Jahr 2006 im Fachbereich Geowissenschaften / Geographie - Phys. Geogr., Geomorphologie, Umweltforschung, Note: 1,5, Rheinisch-Westf�lische Technische Hochschule Aachen, Sprache: Deutsch, Abstract: Die Trockenr�ume der Erde nehmen insgesamt eine Fl�che von 48 Mio. km ein. Dies entspricht ungef�hr 36 % der Festlandsregionen. Charakteristisch f�r diese Gebiete sind eine Verdunstung, die h�her ist als die j�hrliche Niederschlagsmenge. Folglich k�nnen je nach Temperatur und Windverh�ltnissen Gebiete mit unterschiedlichen Niederschlagsmengen arid sein. Diese Gebiete der Erde sind einer akuten Gef�hrdung durch den Desertifikationsprozess ausgesetzt. Insgesamt sind weltweit Gebiete mit �ber 3,6 Mrd. ha Fl�che, das entspricht ungef�hr der Fl�che Nord- und S�damerikas zusammen, in 110 Staaten mit einer Gesamtbev�lkerung von ca. 1 Mrd. Menschen von Trockenheit und Desertifikation bedroht (DICHOR�, 2002, 20). Dabei gehen j�hrlich um die 6 Mio. ha Land unwiederbringlich verloren. Weitere 21 Mio. ha werden in solch einem Ma e degradiert, dass eine landwirtschaftliche Nutzung unwirtschaftlich geworden ist. Insgesamt gehen pro Jahr ca. 24 Mrd. t Oberboden (entspricht in etwa der gesamten landwirtschaftlichen Nutzfl�che der USA) irreversibel verloren. Die dadurch entstehenden j�hrlichen Einkommensverluste werden auf ca. 42. Mrd. US-$. Da Desertifikation durch menschliche Aktivit�ten bzw. durch menschliche Passivit�t hervorgerufen worden ist, sollte durch ein ver�ndertes Verhalten auch ein Aufhalten oder zumindest eine Verlangsamung der Desertifikationsprozesse m�glich sein (UNEP 1987, 1). Diese Arbeit beginnt mit der geographischen Verbreitung der Trockenr�ume auf der Erde. Dabei werden auch die Zusammenh�nge zwischen der Verbreitung der Trockenr�ume mit unterschiedlichen Klimaten herausgestellt. Danach folgt eine Er�rterung der Ursachen von Desertifikation. Am Ende werden Gegenma nahmen vorgestellt, die der (Fortschreitung der) Desertifikation entgegenwir
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