(5) _________

A recent development in the tourist industry has been the rise of ecotourism. This means that people want to be sure that their travels do not affect the environment, or other people, in a negative way. Some tourists, for example, choose not to travel by plane. Airplanes use a great deal of fuel and release a high level of carbon dioxide, which can harm the environment, other travelers do not buy souvenirs made from endangered animals and plants. They also do not take part in activities that may damage the natural environment. Some vacations are especially designed for ecotourists. They give people a chance to take part in conservation projects.