Option to sort by emission when booking flights

Reusable coffee cups for take away coffee and in-flight.

Getting more passengers on a bigger modern planes on certain routes will lower the emitted carbon dioxide per passenger as well as optimize the use of flight crews.

Use travellers feces from flights as a bioproduct. As fuel or to something else useful.

Put some pressure on Swedavia to create more EV charging in the parking and use "Green Electricity" This is more of the total experience of travelling.

Instead of serving main meals on the flight briefly after takeoff, service the meal in the boarding area. Save load, effort and waste.