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Destruction of Natural Habitats When people build cities or cut down forests to obtain wood or to clear land for farming, they destroy the habitats that animals need to survive. For example, grizzly bears and mountain lions once roamed freely where the city of San Francisco now stands. But a wild grizzly bear or mountain lion could not survive in San Francisco today. The habitats of animals in tropical forests are particularly threatened today. People are rapidly cutting down these forests to obtain such valuable hardwoods as mahogany and teak. They are also clearing the land to plant crops. However, soils in such areas are not especially fertile, and farms there produce crops for only a few years. To continue farming in such areas, people have to keep cutting down more of the forests to create new farmland. By the early 1990's, about two-fifths of the world's tropical forests had already...

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