Airplanes emit nitrogen oxides, which are chief contributors to smog, acid rain, and water quality deterioration.
World travel can be a wonderful way to promote peace, gain understanding, and create friendship between people of different cultures. At the same time travel and tourism, by its very nature of increasing the flow of people and use of resources in an area, can contribute to economic inequalities or cultural and environmental degradation. “Responsible tourism” is a movement that seeks to combat the potential negative impact of travel and protect and preserve local people, including their land and economy.