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註釋The first in a series of titles providing scientifically accurate, concise and well-illustrated accounts of major environments which are, or soon will be, under threat. This volume provides a vivid picture of the world's grandest and most awe-inspiring desert, the Sahara. Much of it man-made, mostly of comparatively recent origin, it is today expanding inexorably into the Sahel savanna bordering its southern flanks. Whether geographer, meteorologist, geologist, botanist, zoologist, sociologist or anthropologist no true scientist can fail to respond to the intellectual problems that emerge from the study of this immense zone of desolation, or to the exciting ideas that it generates.