There are a small percentage of flat out deniers. They are fringe. Their numbers overestimated.

On the other hand there is a large group of "I don't believe humans are a major contributing factor." Given what we know about the planet's history it's foolish to consider these ppl deniers. They believe. It's the cause they don't agree with.

This is becoming a classic case of too many people being worried about the wrong problem. Deniers aren't the issue. It's the "it ain't because of humans" cluster.