The unit to measure passenger transport demand is the passenger-kilometre (pkm), which represents one passenger travelling a distance of one kilometre. It is based on transport by passenger cars, buses and coaches and trains. The decoupling indicator is calculated as the ratio of passenger transport demand to GDP measured in 2000 constant prices.
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Fly only for distances greater than 700 km. Otherwise take the train. A transatlantic flight produces almost half as much CO2 as an average person produces over a period of one year while meeting all his or her other needs, such as lighting, heating and car travel!
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