Pay for luggage by weight.

Offer an educational series during the flight about climate change and what passengers can do to help.

Flying less emits less CO2. Thereby minimizing the impact on the planet.

A lot of ground equipment is still driven by internal combustion engines, and can be upgraded to run on electric instead for better efficiency.

Ask gold members how much luggage they plan to bring to plan for correct weights. A lot of business travels include 3 checked bags but the majority flies with handluggage

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