Which phrase is preferable? Obviously I can't really use that last one (dangit). But if I don't use Climate Change or Global Warming, what DO I use? Those who are concerned and worried think that "Climate Change" and "Global Warming" are synonymous. Those who are more doubtful think that Climate Change is just natural cycling of changes in climate, and they think Global Warming is a crock. So to them, if I used "Climate Change", they wouldn't think of that in context of being human-caused. But use Global Warming and it immediately turns them off. And in my opinion, "Global Warming" is misleading because then when people experience a cold winter or live in a colder area they think that's proof that Global Warming isn't happening. A surprising number of people also believe that "Global Warming" is thinning of, or a hole in the ozone layer.
Oh I know, I could remove all confusion and call it "Anthropogenic Global Climate Change"! Except wait...that will actually lead to more confusion since most people who haven't read scientific papers on the subject will have no clue what anthropogenic means. (FYI it means caused or produced by humans.)