Luntz did not "come up" with it. By 2003 -- when Luntz started pushing for this term, all the green groups were already using it. The inflection was point was 1

Luntz did not "come up" with it. By 2003 -- when Luntz started pushing for this term, all the green groups were already using it. The inflection was point was 1998. You can see this in the google n-gram data or just do a time-boxed google search. Every single green group switched to "climate change" by 2001, two years before Luntz started talking about it.