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Macintosh Picture Format  |  1996-09-10  |  187.4 KB  |  640x310  |  8-bit (220 colors)
   ocr: - droppings, which are called guano. For centuries, this excretion was gathered by coastal people for use as fertilizer, at a slower rate than that of production. When 3 guano began to be exported to the a 2 Northern Hemisphere, however, its harvesting soon outpaced its creation. Moreover, guano-mining practices destroyed many nests. Asa result, the bird population of the Guano Islands was disastrously diminished. With the introduction of synthetic fertilizers, the demand for guano has decreased, and the mining of it is now regulated, reducing the pressure on the bird populations and allowing ...