Roughly one in four Americans agrees with the statement that climate change is a hoax, according to survey data from 2020. Across Western countries, the number ranges from about 11% in Germany to 24% in the United States. The reasons people arrive at this belief are not simple ignorance. They involve a mix of organized corporate campaigns, political identity, psychological self-protection, eroding trust in institutions, and a digital information ecosystem that reinforces whatever someone already believes.
The Fossil Fuel Industry Shaped the Narrative
The single most important reason climate denial exists at scale is that powerful industries spent decades deliberately creating it. Internal documents obtained through congressional investigations show that major fossil fuel companies have known for more than 60 years that burning their products causes climate change. A December 2015 internal email from an ExxonMobil communications advisor acknowledged the company didn’t “actually dispute much of what these stories report” about its early climate knowledge. Yet for decades, these same companies funded campaigns to undermine public understanding of the science.
The organized denial effort launched almost immediately after climate change entered public awareness. James Hansen’s landmark 1988 congressional testimony put global warming on the national agenda, and by 1989, four books arguing against the science had already been published. The effort was initially centered in corporate America through the Global Climate Coalition, a group of fossil fuel and manufacturing companies. Influential physicists like Frederick Seitz, Robert Jastrow, and Fred Singer worked to publicly criticize climate science and received significant media visibility, lending an air of scientific legitimacy to the doubt.
When several corporations pulled out of the Global Climate Coalition and it dissolved in 2002, conservative think tanks stepped in to fill the role. The Cooler Heads Coalition, centered at the Competitive Enterprise Institute, continued the work of casting doubt on climate research. Companies also embedded themselves in academic institutions. Shell, for instance, spent $25 million over five years funding an energy research program at UC Berkeley and planned to “embed” Shell scientists there. BP funded research partnerships at Harvard and Tufts but recommended cutting the budget when those partnerships didn’t provide enough “value” to the company. These strategies blurred the line between independent research and corporate interest, giving people legitimate reasons to question whose interests the science served.
The financial stakes were enormous. The fossil fuel industry receives more than $600 billion annually in subsidies. Companies like BP spent millions on “hard persuasion” tactics, including television advertising and even constructing a salmon hatchery to associate the brand with healthy ecosystems. This wasn’t a grassroots movement of skeptical citizens. It was a manufactured information campaign with a business model behind it.
Political Identity Drives Belief More Than Evidence
A meta-analysis of 171 studies across 56 nations found that the single strongest demographic predictor of whether someone believes in climate change is political ideology. People who identify as liberal consistently believe in and support action on climate change more than those who identify as conservative. This pattern holds globally, not just in the United States, with a measurable gap (Cohen’s d of 0.35) between the two groups.
What makes this especially powerful is that political identity doesn’t just correlate with climate beliefs. It appears to cause them. In experiments conducted in Australia, when conservatives were reminded of their political identity before being asked about climate change, they reported lower belief in human-caused warming and less support for climate policy than conservatives whose identity wasn’t made salient. In other words, the same person can shift their stated beliefs depending on whether they’re thinking of themselves as a conservative in that moment.
This happens because climate change has become a tribal marker. Accepting or rejecting it signals which group you belong to. Once that association forms, changing your mind about climate science feels like betraying your community, which is a much higher psychological cost than simply updating a factual belief.
The Psychology of Motivated Reasoning
When information threatens something central to your identity, your brain doesn’t process it neutrally. You engage in motivated reasoning: interpreting, dismissing, or reframing evidence to protect your existing beliefs. This isn’t a character flaw or a sign of low intelligence. It’s a well-documented cognitive pattern that affects everyone, though it becomes especially strong when group identity is at stake.
Large-scale studies on misinformation during COVID-19 found that when information clashes with identity or group affiliation, people selectively dismiss or reinterpret even clearly debunked facts. The same identity-protective dynamics are well documented in climate skepticism. A person who has built social connections, voting habits, and a worldview around skepticism of government regulation will naturally resist information that implies massive government intervention is necessary.
Small differences in how people initially interpret ambiguous information can compound over time through what researchers call the “pyramid of choice” model. Two people start with similar uncertainty, but one leans slightly toward acceptance and the other toward skepticism. Social media feeds, partisan news, and conversations with like-minded friends reinforce each lean. Over months and years, the gap between them widens dramatically, even though they started from nearly the same place and have access to the same facts.
Eroding Trust in Scientists and Institutions
About 22% of Americans report having little or no trust in climate scientists. That distrust doesn’t come from nowhere. The rise of the New Right in the United States coincided with increased polarization around public trust in science generally. Part of this is ideological: some political movements explicitly contest the role of scientists in shaping policy, viewing it as unelected experts overriding democratic decision-making. Part of it is practical: when people learn that fossil fuel companies funded university research programs or that industry scientists were embedded at major institutions, it becomes genuinely harder to distinguish independent science from corporate influence.
Researchers identify two processes at work. One is psychological science rejection, where people distrust scientific methods and findings on a gut level. The other is ideological science rejection, where distrust is driven by political worldview, populist sentiment, or opposition to the policy implications of the science. Both feed climate denial, but the ideological version is more powerful because it connects to broader feelings about government overreach, elite condescension, and cultural alienation. For many skeptics, rejecting climate science is less about thermometer readings and more about rejecting what they see as a political agenda dressed up in lab coats.
Social Media Algorithms Amplify Doubt
Social media platforms use engagement-driven algorithms that prioritize content generating strong emotional reactions. Sensational or provocative claims about climate science, whether a viral post claiming scientists are lying or a misleading graph, naturally generate more clicks, shares, and comments than a measured explanation of atmospheric physics. The algorithms don’t distinguish true from false. They optimize for engagement, and outrage engages.
Bots and automated accounts play a documented role, targeting emotionally charged environmental content to maximize reach. Platforms like Twitter (now X) amplify false claims through retweets and trending topics, while Facebook’s design encourages prolonged engagement within closed groups where members rarely encounter opposing viewpoints. The result is echo chambers where climate denial beliefs are reinforced continuously, and the speed of viral diffusion means a misleading claim can reach millions before any correction catches up.
The Scientific Arguments Skeptics Use
One of the most common claims is that the sun, not human activity, is responsible for warming. It sounds plausible on the surface, since the sun obviously drives Earth’s climate. But satellite measurements since 1978 show no upward trend in solar energy reaching Earth. The sun follows a natural 11-year cycle of small fluctuations, but there has been no net increase in solar output since the 1950s, while global temperatures have risen sharply over that same period.
There’s also a telling detail in how the atmosphere is warming. If the sun were the cause, every layer of the atmosphere would warm, from the surface to the upper atmosphere. Instead, what scientists observe is warming at the surface and cooling in the upper atmosphere. This pattern is consistent with heat-trapping gases building up near the surface, essentially acting like a blanket, and inconsistent with the sun simply putting out more energy. NASA describes these two findings as “smoking guns” ruling out solar activity as the driver of recent warming.
Other common skeptic arguments include pointing to cold weather events (which confuse local weather with global climate trends), questioning temperature measurement methods, or claiming that climate has always changed naturally. The natural variability argument contains a grain of truth: Earth’s climate has shifted dramatically over geological time. But the current rate of warming is far faster than any natural cycle, and it tracks precisely with the rise in greenhouse gas concentrations from burning fossil fuels.
Why It Persists
Climate denial persists because all of these factors reinforce each other. Fossil fuel companies created the initial doubt. Political movements adopted that doubt as a tribal marker. Psychological mechanisms make the doubt self-sustaining once it takes hold. Distrust in institutions makes people receptive to alternative explanations. And social media algorithms ensure those alternative explanations find their audience efficiently and repeatedly. A person doesn’t need to encounter all of these influences. Any one of them can be enough to seed skepticism, and the others keep it alive.
Globally, about 19% of people agree that climate change is a hoax and that scientists claiming it exists are lying. That number is highest in the United States and lowest in countries where climate change has been less politically polarized. The gap suggests that the belief is driven less by the strength of the scientific evidence, which is the same everywhere, and more by the political and media environment people inhabit.