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Despite such problems as pollution and overcrowding, most nations continue to encourage tourism. However, unrestrained tourism has left its mark on much of the worlds natural environment. For example, to take photographs, some tourists disobey the rules of African wildlife preserves and ask guides to drive as close as possible to rare and endangered animals. Tourism has been blamed for spoiling the French Riviera, a region along the Mediterranean coastline. Overconstruction has led to overcrowding, and wastes have polluted the Mediterranean Sea. Now, the Alps and the Himalayas are also threatened by tourism.