The purpose of this research is to develop training scenarios on environmental education using Science, Technology, Society, Environment (STSE) model integrated into scientific thematic lessons, particularly for prospective early childhood teachers. In addition, product efficiency on the positive attitudes of the trainers towards the environment was examined. The above-mentioned objectives are possibly achieved with the following activities: 1) initializing the Borg & Gall model (1999) and 2) assessing the resulting product value using t-test, termed pre-test and post-test. Therefore, the applied simulations were declared suitable for use after series of developmental events.