The aim of this study is to assess the egoistic, altruistic and biospheric awareness of the consequence of high school students regarding the loss of bio-diversity, then comparing the results on the basis of some independent variables (gender, class and family income). The research data were collected from 884 ninth and tenth grade high school students through the survey on the consequence of awareness of the loss of bio-diversity. According to the outcome of the research, students believed in biospheric, egoistic and altruistic results at the similar levels. While the impact of gender and family income on biospheric, altruistic and egoistic awareness of consequence is not so significant, the impact of class is significant on biospheric and altruistic awareness of consequence. Finally, class level and school variables may lead to the prediction of awareness of consequence on loss of bio-diversity; school type-family income, parent education levels not.