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Airplanes are becoming the first choice of transportation by more

and more people.Some protesters claim that air travel should be restricted because of its maive pollution and too much fuel consuming.I find it extremely difficult to side with them.First of all, the most obvious merit of travelling by air is its speed.You can fly from London to New York in about four hours.By contrast, you would spend nearly a month on the sea by ship.This would save a lot of time and the expenditure is correspondingly much le.What is more, it is often more comfortable and convenient for long-distance journey, which spares you numerous transfers.By now, no other modes of transportation can compare with airplanes in all these aspects.Another reason lies in the fact that air travel is an eential factor

in the blueprint of the global village.If some restrictions are placed on it, the proce will definitely be slowed down and many sectors such as international trade，tourism or communication will be negatively influenced.Of course, there is no denying that traveling by plane produces

greenhouse gas and is fuel-consuming.But one fact should be made clear that the main source of world’s emiion is private cars rather than airplanes.Moreover, alternative energies are being explored and some have already come into being.It is imaginable that in the near future we can enjoy the journey from Beijing to London in planes powered by new energy.So overall, I am optimistic about the future of air travel and firmly

believe it should not be restricted.I see no point in those who travel weekly acro the country or even the globe by plane, advocating this tool should be restricted.