is on about CFCs and the ozone hole. He’s asking the wrong question.
The question I always ask is “how does a molecule as heavy as dichlorodifluoromethane (Freon-12, CCl2F2) get up that high in the atmosphere?”
I never get a good answer, but I do know that Freon-12 is heavier than air. I installed too many air conditioners in my misspent youth not to know that.
(Interesting site I found while refreshing my memory on the chemical composition of Freon-12:
Puron and Freon 12 are the Biggest Scams to Hit the American Public Since the Money System.
I don’t disagree. And Dad used to say the same thing.)
LATER: Wow, stuff I never saw before:
Behind the Freon Frenzy
A "surly curmudgeon[], suspicious and lacking in altruism." (Robert A. Heinlein)