Emissions are measured in tonnes. Domestic aviation and shipping emissions are included at the national level. International aviation and shipping emissions are included only at the global level.

Emissions are measured in tonnes per person. International aviation and shipping emissions are not included.

Energy intensity is measured as kilowatt-hours of energy needed per passenger kilometer. This is based on data from the US.

Air freight is the volume of freight, express, and diplomatic bags carried on each flight stage (operation of an aircraft from takeoff to its next landing), measured in metric tonnes times kilometers traveled.

The number of passengers transported by rail, multiplied by the kilometers traveled. This is measured in passenger-kilometers.

Revenue Passenger Kilometers (RPK) measures the number of kilometers traveled by paying passengers. Both domestic and international air travel are included here. International flights are allocated to the country of departure.

Revenue Passenger Kilometers (RPK) measures the number of kilometers traveled by paying passengers. Both domestic and international air travel are included here. International flights are allocated to the country of departure.

Revenue Passenger Kilometers (RPK) measures the number of kilometers traveled by paying passengers. Both domestic and international air travel are included here. International flights are allocated to the country of departure.

Revenue Passenger Kilometers (RPK) measures the number of kilometers traveled by paying passengers. It is calculated as the number of revenue passengers multiplied by the total distance traveled. International aviation is here allocated to the country of departure.

Revenue Passenger Kilometers (RPK) measures the number of kilometers traveled by paying passengers. It is calculated as the number of revenue passengers multiplied by the total distance traveled. International aviation is here allocated to the country of departure.