Air Pollution

Tourism is a popular activity in the world now and that bring a lot of benefit to government. But at the same time, Tourism can cause the same forms of pollution as any other industry: air emissions, noise, solid waste and littering, releases of sewage, oil and chemicals, and even architectural/visual pollution.
In response to the rising number of tourists and their greater mobility, transport by air, road, and rail is continuously increasing. From a report by the International Civil Aviation Organization (ICAO) stated that the number of international air passengers’ world-wide rose from 88 million in 1972 to 344 million in 1994. Tourism now accounts for more than 60% of air travel and is therefore responsible for an estimated 7% of total carbon globally. This percentage is likely to increase the number of international travelers expected to increase from 594 million in 1996 to 1.6 billion by 2020.
According to the Natural Resource Defense Council (NRDC), fuel burned by airplanes puts nitrogen oxide and water vapour about 30,000 feet. These are two greenhouse gases together give as much as twice the global warming effect as the carbon dioxide released by the airplane. One tree offsets the carbon dioxide emitted by the airplane over 4,000 miles and two more trees offset the greenhouse effect caused by the nitrogen oxide and water vapour.
My question is to increasing the tourists really a good idea for our world?