This paper presents results from 15 little publicized state and national environmental surveys in the US that used similar questions. Our analysis reveals trends in adult understanding of environmental issues. These trends indicate that many may have difficulty making informed decisions about environmental policy as citizens, voters, and consumers. Some environmental myths are still prevalent in the US public's understanding of environmental issues. The authors compare data from the National Environmental Education Foundation survey in the US and data from state surveys using the same questions to examine how public knowledge has changed from 1995 to 2008. Environmental myths and how they may affect the public's perception of environmental topics are discussed. The authors suggest the need for greater consistency in the surveys of environmental knowledge to allow comparison among different studies. (Contains 2 tables.)