Germany's Lufthansa, the world's fourth largest airline, received a nine billion euros lifeline, the biggest German corporate rescue caused by COVID-19 so far. This was no exception.

On June 26, for example, the Netherlands announced the details of its financial support for KLM with a bailout package worth of 3.4 billion euros.

Earlier, France announced seven billion euros worth of support for Air France.

However, as Statista's Raynor de Best notes, this support comes at a cost for the airlines, as most European governments attach environmental conditions to their support.

This is because the sector's greenhouse gas emissions kept growing up until 2020. Between January and June 2019, for example, carbon emissions from departing flights that originated from Austria and Finland grew by 19 and eight percent, respectively.