Re: Space only
flourocarbons are the lightest of the halogen+carbon chemicals, and actually has a chance at reaching ozone, since F + C + 2H = 18 + 12 + 2 = 32, only slightly heavier than nitrogen, and about the same as oxygen. in other words, it's an actual ozone depleter.
If they can do it with chlorine instead, then no danger of ozone depletion. you'd have to light it on fire to get it "up there" (and by then it breaks down from burning, so no longer a problem). Also diflouromethane would nearly be too heavy to get "up there" without a volcano to help. But flouromethane, that one is a valid concern.
CFC's and HFCs etc. react directly with ozone and deplete it, if it can get "up there" where the ozone is. The question is whether the chemicals are light enough to actually DO that, or if they just hug the ground.
So there is a lot of truth in the CFC + ozone reaction, and the HFC/CFC ability to be a greenhouse gas. My question is whether or not the heavier ones actually DO that. I have seen what happens when an entiire chiller's refrigerant tank leaks into a confined space. It's very very difficult to remove [because it's heavier than air]. So with modern refrigerants (and even R12) they're much too heavy to get to the upper atmosphere. If one of THOSE chemicals would do the trick, it would be a lot better than using flouromethane.
But yeah, flouromethane, bad idea for general use. Except in space.