http://www.dutyfreeworldonline.com - More than a billion people board international flights each year. This amounts to millions of tons of carbon dioxide emission in the atmosphere. Pollutants left by an airplane in the atmosphere is worse than smoke coming from cars and factories for the simple reason that an airplane is already up there while a car’s emission may take some time to reach the ozone layer. It’s been more than a century since Orville Wright piloted the first powered flight 20 feet above the ground that covered a total of 120 feet and lasted for 12 seconds.

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