Vapour Trails.

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DaveReading

Don't suffer fools gladly (must try harder!)
Location
Reading, obvs
Jet powered aircraft do pollute of course, but the visible trails you can see are water vapour. Hot air hitting cold air under certain conditions = condensation.

With the emphasis on "under certain conditions". And not just jet aircraft.

The Americans did a lot of work in WWII trying to understand what combination of conditions lead to vapour trails, because of the implications for their daylight bombing raids.
 
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classic33

Leg End Member
They fitted the U-2 with a rear view mirror so that the pilot could alter his height and prevent contrails from forming.
 
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