It just sounds a little dry. I think environmentalists have done a good job drilling the fact that it is a bad thing into us, but in the face of it “climate change” sounds like a sort of generic and neutral process. Global warming was a little better (I think? Or maybe I just grew up knowing it was a bad thing).

Climate Instability sounds sort of clearly bad (I think most people consider instability bad).

If we're workshopping this for you: "climate change" has alliteration and is only 3 syllables compared to "instability" which has a mouthful of 5 syllables.

Alliteration has to do with sounds, not letters.

Someone else suggested Climate Crisis which is actually alliterative and also sounds bad rather than neutral like “change.”

Seems like you are really interested in marketing.

It’s just the way the conversation happened to flow. I think everyone has an opinion on names.

For solutions I’m in favor of really aggressive carbon taxes and sanctions/secondary sanctions against that don’t implement them. But that’s the sort of thing better left to regulators and diplomats.