The Association for Psychological Science has an item on the psychology of those who doubt predictions of climate apocalypse caused by CO2. Apparently:-
Or consider global warming. More than 90 percent of climate scientists agree that the global climate is shifting, largely as a result of human activity. Scientifically, this is essentially a closed case. Yet conspiracy theorists continue to spin wild tales of government agents surreptitiously destroying thermometers and burying contradictory evidence.
It's not easy to understand how anyone gets through peer-review with a statement such as scientifically this is a closed case. I sometimes wonder, in my more cynical moments, if psychologists just make things up because their profession allows them to. Presumably it does. Either that or guys like this are on the fringe.