International ban on private jets. Everyone can fly commercial. With option like business and first class this should be achievable if all nations want to reduce emission

Collect food waste separately, return as food for the animal farms supplying the meals, creating a true circular supply chain.

Make the app as lightweight as possible. Remove images, animations and leave only the bare necessities. This saves data transfer and storage - which in turn saves energy.

Dynamic seating - people with checked in baggage should be placed towards the rear of the plane as they are more likely to have to wait anyway on arrival at destination.

Use more Airbus A320-XLR on long haul to destinations like Kathmandu, Delhi, Bombay and Colombo Sri Lanka

Earn EuroBonus points when recycling. Collaborate with apps such as Bower and Repeat in Sweden. They offer cash rewards for recycling. Why not reward points instead!