Across five preregistered experiments involving 5,081 participants, researchers led by Kevin E. Tiede probed perceptions of both climate attitudes and actual behaviors. They replicated the classic finding: people systematically underestimate the public’s broad backing for climate action, from acknowledging the crisis to endorsing policy measures. But when the team shifted focus to specific, costly actions—donating money, volunteering, or political engagement—a striking reversal emerged.

Participants consistently overestimated how many others perform these rare behaviors. In reality, only a tiny fraction of the population donates to climate groups or attends protests, yet people guessed far higher frequencies. This dual misperception—underestimating widespread concern while overestimating uncommon deeds—held robustly across all experiments, expanding on earlier hints that pluralistic ignorance might not act uniformly.

What drives this asymmetry? The researchers tested motivated reasoning and social projection but found that these could not fully account for the pattern. Instead, the data point to a fundamental cognitive bias in how people estimate proportions. When judging percentages, individuals mentally compress the scale: very high frequencies are dragged downward, while very low ones get pulled upward. This resembles the probability weighting function from prospect theory, where people overweight small probabilities and underweight large ones. Crucially, the same bias appeared when participants estimated unrelated domains, confirming that it is a general mental shortcut rather than a climate-specific distortion.

The team tested a formal regressive model in which estimates are pulled toward a perceived average, and found it outperformed competing explanations. The rarer the behavior, the more inflated the estimate—a finding that dovetails with decades of judgment research showing that humans have a notoriously difficult time grasping low-probability events, often exaggerating them in both fear and hope.

The study’s most critical test examined whether correcting these misperceptions changes real behavior. In the final experiment, participants received accurate information about the true high level of public support and the true low prevalence of donations. They then faced a consequential decision: allocating a portion of their own payment to a climate charity. The correction nudged up self-reported willingness to donate in hypothetical scenarios, but it failed to shift actual donation amounts. People acknowledged the corrected social reality yet held onto their wallets.

This gap between intention and action challenges the widespread assumption that pluralistic ignorance is a master lever for climate engagement. Acknowledging that most people care may reduce the spiral of silence and strengthen perceived norms, a worthy outcome in its own right. But it does not automatically convert concern into personal costly contributions. The overestimation of rare behaviors adds a further wrinkle: if people already think donating is more common than it is, learning the stark truth could even be demotivating.

The research does not imply that social norms are irrelevant. Underestimating support for climate policies can still suppress advocacy, and correcting that perception remains valuable for building political will. For behaviors with tangible personal costs, however, cognitive barriers run deeper than simple misinformation. The authors suggest future interventions need to go beyond providing accurate social statistics, possibly by enhancing individuals’ sense of efficacy or reducing the friction of taking action.

As climate change accelerates, untangling the architecture of our social misconceptions grows ever more urgent. The study reveals that people carry a double illusion: they see the silent majority as less green than it is, while imagining an active minority far larger than reality. Dispelling these illusions may be necessary, but it is far from sufficient. The real challenge is to bridge the chasm between knowing what others think and doing what the planet needs.

Subject of Research: People’s misperception of climate action engagement, pluralistic ignorance, and cognitive biases in estimating social proportions

Article Title: People systematically under- and overestimate public engagement in climate action

Article References: Tiede, K.E., Maur, K. & Betsch, C. People systematically under- and overestimate public engagement in climate action. Nat. Clim. Chang. 16, 774–780 (2026). https://doi.org/10.1038/s41558-026-02668-z

Image Credits: AI Generated

DOI: 10.1038/s41558-026-02668-z

Keywords: pluralistic ignorance, climate action, social norms, cognitive bias, behavior change, probability estimation, misperception, donation behavior