Airports are basically the epitome of using fuel as if it's abundant. Jet aircraft can only exist and be economically used when fuel is cheap and easily available. In any case airports are centers of air pollution due to all the vehicles flying in and out all day long, plus all the ground vehicles. There are service vehicles and a dizzying array of other vehicles running around, including those shuttling people around the airport, and to or from the airport.
While there isn't much which can be done to increase fuel efficiency for the aircraft, or reduce emissions due to the aircraft, the ground vehicles are another matter. The article goes into several programs meant to decrease emissions from the ground vehicles.
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