Now you said -
Let us define "contrarian" in this context as "disputing that current global warming is happening and that it results from human activity".
Why don't you illustrate your use of the concept with a dozen or so scientists who are in congruence with your concept, then? Ah, I see a problem. You want to define contrarian as believing ....
GW does not exist AND
GW does not result from human activity
Well, you will have difficulty finding people who believe something exists and does not exist at the same time. So your definition isn't any good. No wonder you were not finding many published "contrarians", as you would call them. I suspect you didn't find any. So you are worried about "contrarians" whom don't exist. Hmmm....