About 24% of Americans fall into the “doubtful” or “dismissive” categories when it comes to climate change, meaning they either question whether global warming is happening or actively reject the idea. That’s roughly one in four adults in the U.S. alone. The reasons aren’t simple, and they rarely come down to a lack of intelligence or access to information. Instead, climate skepticism is driven by a tangle of psychological patterns, political identity, cultural values, and communication failures that reinforce each other.
Political Identity Is the Strongest Predictor
The single biggest factor shaping whether someone accepts climate science in the United States is their political affiliation. According to Stanford University tracking data, only 43% of Republicans believed the world’s temperature has been rising over the past century in 2024, compared to 88% of Democrats. That 45-percentage-point gap is the largest it has ever been, and it has been widening steadily: the partisan divide on whether warming is mostly human-caused grew from 21 points in 2018 to 27 points in 2020 to 38 points in 2024.
This isn’t because conservative voters never encounter climate data. Reported knowledge about climate change is high across all political groups. The gap is about what people do with that knowledge once it collides with their political identity. When accepting a scientific finding means aligning with the opposing political tribe, or implies support for policies you oppose, the psychological cost of agreement goes up dramatically. Climate change became a partisan litmus test in the U.S. decades ago, and that framing has only intensified.
Motivated Reasoning and Confirmation Bias
Humans don’t process information like calculators. We filter new evidence through what we already believe, what our social group believes, and what feels threatening to our sense of self. Psychologists call this motivated reasoning, and it’s one of the core engines of climate skepticism.
Confirmation bias plays a specific role here. People tend to seek out and accept information that fits their existing views while dismissing anything that would require them to change their mind or their behavior. Someone who has built a career in fossil fuels, or who values small government and sees climate policy as regulatory overreach, has strong motivation to find flaws in the evidence rather than accept it at face value. This isn’t unique to climate. It’s the same cognitive pattern that drives resistance to new information on diet, vaccines, or financial decisions. But climate change triggers it with unusual force because the implications touch so many aspects of daily life, from energy use to transportation to economic policy.
Research in psychology frames this as “identity defense.” When a scientific finding threatens someone’s worldview, group membership, or livelihood, rejecting the science becomes a way of protecting who they are. This means that presenting more data to a skeptic can sometimes backfire, pushing them to dig in further rather than update their position.
Distrust of Scientific Institutions
Climate skeptics frequently express doubt not just about the data, but about the people and institutions producing it. Some question how a trace gas like CO2, measured in parts per million, could influence something as vast as the global climate. That intuition, that something so small can’t have such large effects, has been a barrier to acceptance since the earliest days of climate science.
Others doubt the widely cited scientific consensus itself, viewing it as the product of groupthink, funding incentives, or political agendas. Research on science denial finds that skeptics of both climate change and vaccines share common patterns: they distrust mainstream scientific institutions, actively promote alternative explanations, politicize the issue, and create their own competing narratives. The internet has made this far easier than it was a generation ago. Someone looking for reasons to doubt climate science can find professional-looking websites, videos, and commentators offering exactly that within seconds.
Trust in science isn’t evenly distributed across the population. It correlates with education, political affiliation, and personal experience with scientific institutions. When trust erodes in one domain (say, public health messaging during a pandemic), it can spill over into skepticism about climate science as well.
Religion and Cultural Worldviews
Religious beliefs influence climate attitudes in complex ways. Research from a large UK study found that Christians were about 6 percentage points less likely to report being “very concerned” about climate change compared to non-religious participants. Some of this traces to the “dominion thesis,” a theological interpretation that humans have been granted control over the natural world, which can reduce environmental concern by framing nature as something placed here for human use rather than something that can be irreversibly damaged.
But the relationship isn’t straightforward. The same study found a J-shaped pattern: highly religious people actually engaged in more climate-friendly actions than agnostics or moderately religious people. And faith leaders can shift attitudes significantly. When Pope Francis released his 2015 encyclical on the environment, it measurably increased climate concern among American Catholics. The influence of religion on climate belief depends less on faith itself and more on which messages and leaders a person is exposed to within their faith community.
Fear-Based Messaging Often Backfires
One underappreciated driver of skepticism is the way climate change gets communicated. Alarming messages about catastrophic tipping points, civilizational collapse, and irreversible damage can capture attention, but research consistently shows that fear-based appeals backfire unless they’re paired with a sense of hope and practical solutions. Without those, fear triggers emotional self-protection: denial, disengagement, or fatalism. If the problem sounds too big to solve, some people cope by deciding it must not be real.
Climate change is also uniquely difficult for the human brain to process. It’s abstract, gradual, and psychologically distant for most people in wealthy nations. The worst effects are projected decades into the future or concentrated in places far from where many skeptics live. Humans evolved to respond to immediate, visible, concrete threats. A slow-moving, invisible, global phenomenon doesn’t trigger the same alarm systems, which makes it easier to minimize or dismiss.
Does Extreme Weather Change Minds?
You might expect that living through a wildfire, hurricane, or historic heat wave would push people toward accepting climate science. The evidence on this is surprisingly mixed. Some studies find that experiencing extreme weather increases climate concern, support for green policies, and willingness to adapt. Others find no relationship at all. Studies using objective geographic measures of extreme weather exposure, rather than asking people whether they feel they’ve experienced extreme weather, often find no measurable shift in attitudes.
Part of the explanation is that people interpret extreme weather through their existing beliefs. If you already accept climate science, a major flood reinforces what you already thought. If you’re skeptical, you may attribute the same flood to natural variability, bad infrastructure, or simple bad luck. Experience alone doesn’t override the psychological and social filters that shape how people assign cause and meaning to events.
Why the Gap Keeps Growing
What makes climate skepticism so persistent is that none of these factors operate in isolation. Political identity shapes which media people consume. Media consumption reinforces confirmation bias. Confirmation bias erodes trust in institutions that present inconvenient findings. Distrust makes fear-based messaging feel manipulative rather than urgent. And all of this plays out within social networks where agreement with your group is rewarded and dissent carries social costs.
The Yale Program on Climate Change Communication finds that “Alarmed” Americans now outnumber “Dismissive” Americans by more than two to one (25% versus 11%). Overall concern is rising. But the dismissive segment, while smaller, has become more entrenched, more politically organized, and more vocal. The shrinking of the middle, where people might be open to persuasion, is one reason the debate feels more polarized even as the scientific evidence grows stronger.