The cognitive bias behind bad climate math

Understanding how to reduce one's carbon footprint is a challenge for many people. Research shows that this area of knowledge, referred to as "carbon competence," is low among the general public. While the reasons for this gap in understanding are being investigated, a recent study has identified two familiar cognitive biases as significant barriers to improving carbon competence.

These biases, known as the availability heuristic and motivated reasoning, lead to inaccurate perceptions of the effectiveness of various climate actions. According to study co-author Claudia Schneider, a psychologist at the University of Canterbury in New Zealand, people often overestimate the impact of familiar actions like recycling while undervaluing more impactful changes such as flying less and consuming less red meat.

Previous studies have shown similar patterns in people's estimations of the effectiveness of personal climate actions. The study involved over 500 U.S. citizens and presented them with a list of 34 different actions, asking them to estimate what percentage of the average North American's carbon footprint each action could save. The findings confirmed that people's judgments are often skewed towards actions that are top-of-mind or those they personally engage in, and individuals with higher environmental values rated actions more favorably, reflecting optimism about their individual impact.

To address these psychological barriers, the researchers designed two follow-up studies, each involving approximately 1,200 participants. The first intervention aimed to highlight that more effective actions tend to require greater time, money, or comfort, while the second intervention exposed participants to information about the most impactful personal climate actions.

While these strategies showed promise in helping people adjust their overestimations, the researchers found that the effectiveness of these interventions varied greatly among individuals. Interestingly, even straightforwardly communicating the most effective actions did not consistently improve participants' ability to accurately assess climate actions' impact.

The study suggests that a "one-size-fits-all" approach to improving carbon competence is unlikely to be effective. Instead, tailored messages and strategies may be necessary to overcome these cognitive biases and enhance people's ability to make informed decisions about climate actions. Moving forward, researchers are exploring additional factors, such as perceptions of fairness, that may influence individuals' engagement in climate actions beyond their judgment of action effectiveness.