Reduce taxi time,(for larger aircraft) continuous climb and decent, optimized flightpaths, implement greener lounges (green electric), more points for greener choices.

Window shades down when parked at warm days. Keep the fuselage cooler. Experienced it domestic USA and it works

Mount small blades on the side of the wheels to make them spin by themselves before landing to reduce tyre wear upon contact with tarmac.

Same amount of points earned from origin to destination regardless of amount of flights.

Let it be easy to take steps when buying bio-fuel.

Let's start by using SAF at least for domestic flights.