Change your business model to focus on sustainability footprints for your «procts», do an holistic approav from a systemic and life cycle approach, make it comparable

Do not carry ice cubes - drinks are already cold.

Incentivize sustainable behavior, e.g. a small reward for bringing your own coffee cup. This can also be sold by SAS in the Eurobonus store or in flight.

When I am flexible for when to fly, I would be open to SAS selecting the actual flight, getting to fewer, fuller flights.

Use real cutlery as disposable cutlery is not sustainable, not even wood.

Almost all passengers have their own phones/pads these days. Keep them connected with *good* wifi and IFE wont be needed, massive weight savings.