Weird Advert

While I was in London a few days ago, I saw this sign–often.  A bit of background:  there’s tons of discussion here around expanding airports, building a new one, or some mix.  LGW has these adds running.


The part I don’t get is the environmental angle.  Assuming that the elevation, temperature, and other variables are apx the same, wouldn’t a given airplane pollute the same regardless of what airport it took off from?  It doesn’t make much sense to me…

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