We use a new U.S. survey on pro-environmental behaviors, attitudes, and knowledge and find that individuals engage in activities that they believe are more effective in reducing carbon emissions, regardless of whether or not these beliefs are accurate. We find that low provision of the public good is greater among people who believe they cannot do much for the environment and do not consider themselves environmentalists. A policy implication of our results is that the effect of more accurate information on the provision of the public good is ambiguous. (JEL Q50, Q54, C10)