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Ethical travel can mean taking the bus, the train or the subway instead of driving your personal vehicle or taking a taxi whenever possible. If you are flying instead of taking a private aircraft choose an airline that is going to your destination. Flying is considered to be the most environmentally destructive form of transportation because of the huge amounts of fossil fuels that aircraft use. Aircrafts also release a higher level of emissions into the atmosphere than ground vehicles. The good news is that green air travel is on everyone's agenda, thus the airlines are working on ways to make airplanes that are more environmentally friendly. They are doing this by finding ways to increase fuel efficiency and by committing to cutting down on the length of time that an airplane is allowed to idle. Each time you choose a form of mass transportation you are eliminating some pollution, becoming less petroleum dependent and choosing a more ethical travel option. The more we travel using our personal vehicles, the bigger our carbon footprint becomes. While it is true that buses leave a large footprint on the earth when you consider the number of people that take the bus instead of drive, the buses get greater fuel economy per person as well as emit less pollution and greenhouse gases than the number of vehicles it would take if each person drove themselves to their destination, taking the bus is indeed an ethical travel method. Heavy rail transit, typically known as a metro or subway, runs on electricity so no fossil fuels are needed. Although it is the most expensive form of public transportation to build and maintain it has the greatest capacity and best efficiency making it the better choice for environmentally friendly transportation.