This research seeks to investigate the development of environmental attitudes in elementary school students from a commune in Central Chile (Curic & oacute;). A comparative study was carried out between two schools, one with an environmental certification granted by the Ministry of the En- vironment (MMA) and the other without said certification. To carry out the study, two instru- ments were used: identity drawing and a Likert-type scale. Students from first to sixth grade participated from both schools. The sample for school A was 253 students, while that from school B was 448 students. According to the results, there are no major variations in the affective, active and cognitive attitudes among the students and it is established that some dimensions would be changing in terms of pro-environmental attitudes, although what the study cannot assure is if these attitudes are being triggered by the objectives of a state environmental certification or tra- ining actions of an official or hidden curriculum that is increasingly environmentalized.