skepticism
Stephan Lewandowsky tried to make climate skeptics look stupid (by not even bothering to sample them, but impugning their beliefs as irrational from out of population samples), this study turns the tables on his execrable work and suggests that climate skeptics are both analytical and rational.

From the University of Illinois at Chicago:

The moon landing and global warming are hoaxes. The U.S. government had advance knowledge of the 9/11 attacks. A UFO crashed in Roswell, New Mexico.

Is skepticism toward these kinds of unfounded beliefs just a matter of cognitive ability? Not according to new research by a University of Illinois at Chicago social psychologist.

In an article published online and in the February 2018 issue of the journal Personality and Individual Differences, Tomas Ståhl reports on two studies that examined why some people are inclined to believe in various conspiracies and paranormal phenomena.
"We show that reasonable skepticism about various conspiracy theories and paranormal phenomena does not only require a relatively high cognitive ability, but also strong motivation to be rational," says Ståhl, UIC visiting assistant professor of psychology and lead author of the study.

"When the motivation to form your beliefs based on logic and evidence is not there, people with high cognitive ability are just as likely to believe in conspiracies and paranormal phenomena as people with lower cognitive ability."
Previous work in this area has indicated that people with higher cognitive ability - or a more analytic thinking style - are less inclined to believe in conspiracies and the paranormal.

Ståhl and co-author Jan-Willem van Prooijen of Vrije Universiteit Amsterdam conducted two online surveys with more than 300 respondents each to assess analytic thinking and other factors that might promote skepticism toward unfounded beliefs.


Comment: 600 is a VERY small sample size


The first survey found that an analytic cognitive style was associated with weaker paranormal beliefs, conspiracy beliefs and conspiracy mentality. However, this was only the case among participants who strongly valued forming their beliefs based on logic and evidence.

Among participants who did not strongly value a reliance on logic and evidence, having an analytic cognitive style was not associated with weaker belief in the paranormal or in various conspiracy theories.

In the second survey, the researchers examined whether these effects were uniquely attributable to having an analytic cognitive style or whether they were explained by more general individual differences in cognitive ability. Results were more consistent with a general cognitive ability account.

The article notes that despite a century of better educational opportunities and increased intelligence scores in the U.S. population, unfounded beliefs remain pervasive in contemporary society.
"Our findings suggest that part of the reason may be that many people do not view it as sufficiently important to form their beliefs on rational grounds," Ståhl said.
From linking vaccines with autism to climate change skepticism, these widespread conspiracy theories and other unfounded beliefs can lead to harmful behavior, according to Ståhl.

"Many of these beliefs can, unfortunately, have detrimental consequences for individuals' health choices, as well as for society as a whole," he said.


Comment: Those aren't the best examples. While it's one thing to just blindly believe that X or Y is bad (or good), there's growing evidence that certain vaccines have a link with autism. Here's a small sample, and there's many more on which to make an informed decision with:

Yet another study done that links autism with aluminum found in most vaccines
Our government knows new vaccines still cause Autism
Aluminum adjuvant, cytokines, brain inflammation, autism: Did China discover the missing piece of the autism puzzle?

As for climate change, well that's not exactly a conspiracy. A look at the most recent data to come out points to a global cooling trend.


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The study: https://www.sciencedirect.com/science/article/pii/S0191886917306323

Epistemic rationality: Skepticism toward unfounded beliefs requires sufficient cognitive ability and motivation to be rational

Abstract:

Why does belief in the paranormal, conspiracy theories, and various other phenomena that are not backed up by evidence remain widespread in modern society? In the present research we adopt an individual difference approach, as we seek to identify psychological precursors of skepticism toward unfounded beliefs. We propose that part of the reason why unfounded beliefs are so widespread is because skepticism requires both sufficient analytic skills, and the motivation to form beliefs on rational grounds. In Study 1 we show that analytic thinking is associated with a lower inclination to believe various conspiracy theories, and paranormal phenomena, but only among individuals who strongly value epistemic rationality. We replicate this effect on paranormal belief, but not conspiracy beliefs, in Study 2. We also provide evidence suggesting that general cognitive ability, rather than analytic cognitive style, is the underlying facet of analytic thinking that is responsible for these effects.