Well, it always was, wasn't it?
It doesn't matter that the 3.5% of the world's emissions (which is the part aviation fuel plays) is by far the most efficiently combusted.
The other 96.5%? There's nothing there to interest Jim. All those trucks, cars, trains and tankers. All those chemical plants, brickworks, cement manufacturers, by the thousands and millions. They are OK.
Whether aviation threatens health? Not really, is he?
If it goes wrong, it can really threaten your health. Crashes are frequently fatal.
Otherwise, a modern turbofan passenger jet pollutes many times less than the cars and trucks it replaces. So aviation is GOOD for your health, at least until all the world's cars and trucks stop running fossil fuels.
Isn't that it? I think we're done here. What a waste of time this thread has been.