The focus of this study is change in environmental content in Mexican primary school textbooks before and after the decentralization of public education in 1993. The literature review in the opening chapter gives the background information on environmental education, internationally and in Mexico. The authors mention and discuss the major groups involved in the development and initiation of programs and curriculum such as the UNESCO, Man and the Biosphere (MAB), and the Commission on Sustainable Development (CSD). The gradual Mexican ownership of the environmental cause and the promotion of awareness in Mexico lead to the main part of the study.

This study employs both manifest and latent content analysis to find trends and themes in the textbooks. The primary focus of the manifest content analysis is individual words while the latent content analysis stresses excerpts and images from the textbooks. The use of an Excel database and PivotTables generated by Excel to correlate data indicates areas to examine for differences in content between the textbooks. In addition, the use of the two forms of analysis provides validation and significance when the data agree.

The final portion of the study offers some general conclusions for the analysis and a summary of how the environmental content has increased in the primary school textbooks over the period studied. There are also suggestions for future research on the content of textbooks, surveys of environmental knowledge and attitudes, and alternatives to the formal education implied by the use of textbooks in the classroom.