[Udik]

> to aggregate the people that believe that climate change is not happening?

First of all, you shouldn't "aggregate" them. Very few if those who are usually called "climate deniers" actually believe that climate change is not happening. Did you know that?

In general, apart from total deniers, there's people who think climate change might not be as bad, or extreme, or as manmade, or that catastrophic predictions need some check. Labelling them all as "deniers" is just a very handy (and toxic) way to close the conversation.