> one plane landing every 5 minutes 12 hours a day is how much additional CO2 emissions That's quite a reductionist view point. Operating Heathrow at something

> one plane landing every 5 minutes 12 hours a day is how much additional CO2 emissions That's quite a reductionist view point. Operating Heathrow at something near 100% capacity, as it currently does, means that aircraft spend a huge amount of time queueing on the ground (burning a surprising fraction of the fuel they'd use in the air), going around a holding pattern or being vectored all over the sky.