This study investigates how individuals in the United States perceive social norms related to climate change and how these perceptions influence their willingness to act against climate change. Using a large sample of 8,000 US adults, the researchers find that individuals' beliefs about social norms significantly predict their willingness to donate to climate-friendly causes. However, they also document that respondents systematically underestimate the prevalence of climate-friendly behaviors and norms. Correcting these misperceptions through an experiment increases individual willingness to act against climate change and support for climate policies, particularly among those skeptical about the existence and threat of global warming. The study uses a survey experiment to test the effects of two information treatments: one providing truthful information about the proportion of the US population trying to fight global warming (62%), and another providing information about the proportion of the US population believing that people in the US should try to fight global warming (79%). The results show that these treatments raise donations by $12 and $16, respectively, and are most effective for individuals who previously held lower beliefs about the prevalence of climate-friendly behaviors and norms. The study also finds that correcting misperceptions about climate norms can increase support for climate policies, such as carbon taxes and pollution regulation. The findings suggest that social norms interventions could be a cost-effective way to reduce political polarization and encourage climate-friendly behavior. The study highlights the importance of accurate information about social norms in shaping individual behavior and policy support, and underscores the potential of social norm interventions in addressing climate change.This study investigates how individuals in the United States perceive social norms related to climate change and how these perceptions influence their willingness to act against climate change. Using a large sample of 8,000 US adults, the researchers find that individuals' beliefs about social norms significantly predict their willingness to donate to climate-friendly causes. However, they also document that respondents systematically underestimate the prevalence of climate-friendly behaviors and norms. Correcting these misperceptions through an experiment increases individual willingness to act against climate change and support for climate policies, particularly among those skeptical about the existence and threat of global warming. The study uses a survey experiment to test the effects of two information treatments: one providing truthful information about the proportion of the US population trying to fight global warming (62%), and another providing information about the proportion of the US population believing that people in the US should try to fight global warming (79%). The results show that these treatments raise donations by $12 and $16, respectively, and are most effective for individuals who previously held lower beliefs about the prevalence of climate-friendly behaviors and norms. The study also finds that correcting misperceptions about climate norms can increase support for climate policies, such as carbon taxes and pollution regulation. The findings suggest that social norms interventions could be a cost-effective way to reduce political polarization and encourage climate-friendly behavior. The study highlights the importance of accurate information about social norms in shaping individual behavior and policy support, and underscores the potential of social norm interventions in addressing climate change.