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How do you calculate the volume of emissions from a flight?

According to the Intergovernmental Panel on Climate Change, set up by the United Nations Environment Programme and the World Meteorological Organisation, for every 1 kilogramme of jet fuel burnt in the operational phase of the flight, approximately 3.15 kilogrammes of carbon dioxide is released into the atmosphere. 

The total volume of fuel consumed on a flight depends on factors such as the distance travelled, wind speeds, the loading of passengers, baggage, and cargo on the aircraft. For our calculation methods we use historic fuel consumption data that allows for the calculation of carbon dioxide emissions. This figure is divided by the number of passengers on the aircraft, based on a historical average for our passenger aircraft fleet, and the distance flown, allowing an amount of carbon dioxide per passenger kilometre to be calculated.