Since the early 1990s the passenger-kilometers of flights worldwide has increased by 5-6% per year. The CO2 Emissions (carbon dioxide) per passenger kilometer vary due to difference in flight distances¹, aircrafts and load factors (percent of occupied seats) – with average load factors First Class and Business Class are causing nine- and three-times higher emissions per passenger than Economy Class, as one study suggests². Furthermore the mixed exhaust from flights causes 2-4 times more global warming than only CO2 emitted from engines on the ground³. The accumulated climate-effect from flights might be as high as 7-9% of the total effect from anthropogenic greenhouse gases4. However, the following examines only the CO2 Emissions from flights and the implied national costs in Climate Contributions (climate debt). But first see these three seductive animations (from ‘nats‘) with 24-hours flights over ‘Europe 1:59‘, ‘Middle East 1:11‘ and ‘North Atlantic 1:52‘.