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.

Waste reduction challenge: Launch an in-flight competition where the flight producing the least waste per passenger wins a sustainability award

In Scandi all tap water is great. Sell SAS water bottles onboard which are made to be reused = able to buy for points, pre-order as well. And then load tap water onboard.

SAS connects Scandinavia with Europe, through hubs and trains. Fly to a hub, get a train to your destination.

At check-in and at kiosk ask if they really need paper boarding card or can use SAS app instead.

Add green flights on some departures. nothing is served on these flights, only hand luggage is allowed, but you earn more Eurobonus points if you choose such a departure.