The Environmental (2-MEV) Scale questionnaire was developed in Europe to measure adolescents' attitudes and gauge the effectiveness of educational programs. It also formed the basis for the Theory of Ecological Attitudes. In the present four-year study, the 2-MEV Scale was modified for use with 9-12-year-old children in the United States. Initial results led to wording revisions and elimination of some items. Confirmatory Factor Analyses indicated that the remaining items fit the Theory of Ecological Attitude well. The Revised 2-MEV Scale was able to measure statistically significant changes in the environmental attitudes of participants in earth education programs but not in a control group. The Revised ENV Scale can be used to evaluate programs and to investigate the relationship between environmental attitudes and other variables. (Contains 3 tables and 1 figure.)