Hm I always remember hearing this:

In a confidential memo to the Republican party, Luntz is credited with advising the Bush administration that the phrase “global warming” should be abandoned in favour of “climate change”, which he called a “less frightening” phrase than the former.

https://en.m.wikipedia.org/wiki/Frank_Luntz

https://www.theguardian.com/environment/2014/may/27/americans-climate-change-global-warming-yale-report