Green poo means nothing , nada, zilch, zero, if the baby is otherwise doing fine. It is a colour that's on the normal spectrum.
In a baby who is not otherwise doing fine, it may be a sign to check for effective milk transfer.
Forget about hindmilk and foremilk, and about judging its transfer by the time on the clock (as you well know, laundrylover, now don't you?!) . F/m and h/m sort themselves out. It's volume of milk that puts the weight on the baby, and that's affected by the number of times the baby is put to the breast, and the effectiveness of milk transfer when he's there
Greeness has nothing to do with air/wind (????). It's green because it has whizzed through the system too quickly to have been mixed with the bile juices that turn it yellow. That's all!