If they want to reduce aviation emmissions they can start by getting rid of ATC holding, build more runways, and build some more gates, so there are no airborne or ground delays.
Kinda stupid that they bang on about how much emissions they saved over 14 hours only to then waste some because the airport can’t be bothered to build a terminal big enough to satisfy demand.
On saying all that though if they can get biofuel to work without burning up millions of aces of farmland to produce the stuff then it’s probably a win/win.