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> As for CO2 [...] 40+ minutes of being in a queue to take off

Guess what the engines are doing at this time. Even worse if they tell planes to circle before landing because there are too many landings at this time.

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I once wondered why aircraft don't have electric motors (either battery or APU powered) to move them to the holding point at which point the fire up the engines. Turns out Airbus has a patent on it, it's not yet being used due to complexity / weight tradeoffs.

There was this other start up which planned to use AGV to tow the planes till the take off point. Would be much simpler than trying to modify the plane itself.

https://en.m.wikipedia.org/wiki/TaxiBot

> Guess what the engines are doing at this time.

Usually one engine is turned off...

Only with some airlines and at some airports. Not all airports allow it and some airlines don't like it (apparently due to higher stress on the other engine).

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