My personal CO2 emissions should be listed on my boarding pass in the app for each flight.

Allow free rebooking on the day of departure to a shorter route or a route with less stops when available, even in low booking classes and without status.

Sponsor projects that can help build renewable energy sources, like wind mills, solar panels. Additionaly work with selected airports on becoming carbon neutral

Better food = less food waste. I see a lot of boxes not being emptied. So make sure it's good quality food to most peoples liking. Keep it simple and good

Offer Eurobonus points to passengers who order vegetarian/vegan food in advance

And give more SAS bonus points to travelers who book with biofuel. Incentives!