<<Well, this probably trumps my as yet unpatented idea to bank the taxiways leading to runway lineups.
Assuming no stops during the final taxi segment, my calculations had the 35 knot or so lineup groundspeed and resultant reduced energy expenditure saved during the initial takeoff roll leading to some "XXX" tonnes of reduced carbon emissions.>>
Nice one, jonny. At least you brought a little light-hearted lunacy into the matter!