"Climate change" is already watered down from "global warming", because people were nitpicking that it wasn't always warmer everywhere. Things like the late cold snaps people mention in this thread. But: on average, it's warmer almost everywhere.
The term is often misattributed to Luntz, but it existed before him.
Human factor here: Sometimes, change can be a good thing. You don't hear that instability can sometimes be a good thing.