This study attempted to assess the development of environmental virtue in 7th and 8th grade students in an Expeditionary Learning Outward Bound (ELOB) school using an instrument developed for this study--the Children's Environmental Virtue Scale (CEVS). Data for this study were obtained by administering the CEVS survey (pretest and posttest) to students in an ELOB school (n = 45) that included a 10-week expeditionary learning unit. The internal consistency of the survey instrument was determined using Cronbach's alpha reliability coefficients. Mean environmental virtue scores were compared using paired samples t-tests. Significant results indicated a decrease in the mean environmental virtue scores for students who participated in the expeditionary learning unit. Limitations of the study are presented.