High-volume tourism can damage the environment.
Desertification is most severe in Africa.
In Kenya, a three-year drought has withered crops and killed livestock, leaving thousands of people without adequate food supplies. In neighboring Tanzania, widespread tree-felling threatens to transform much of the country's forest into desert. Fire is a primary cause of desertification in the Sahel region of North Africa, where the degradation of drylands is especially pronounced. Estimates suggest that as much as 90 percent of population growth will occur in urban areas. For one thing, more people will need more transportation, particularly automobiles.