I'm not sure that this is the whole story - rather, the risk of CFCs was so obvious that nobody could convincingly argue against it. To this day, going outside in Tasmania burns you noticeably faster than anywhere else in the world.

Global warming, on the other hand, is a slow death by a thousand cuts. Extreme weather events grow more frequent, fishing becomes less productive, desertification takes more land, the sea rises a little higher, and so on - and the endgame is more complicated and less understandable, too. It's easier to ignore.