Summary

The air transport system is one of the most important industries of the world with its global economic impact estimated at $2.7 trillion and equivalent to 3.6% of the world’s gross domestic product. However, the recent growth of air traffic in the air transport system has led to an increase in concerns related to its impact on the climate. The most harmful greenhouse, gas emissions from the air transport system include CO2, NOX, Ozone (O3), carbon monoxide CO and contrails.