Today, the world is faced with many environmental problems, and encouraging the development of ecological awarness in early and preschool education institutions is a long-term goal of modern education. Environmental education should be available to all children, which means that it should start already in early preschool age. How the child will relate and to what extent he will develop positive attitudes, knowledge and habits towards the environment depends first on the actions and attitudes of the parents, and after the parents, educators in early preschool education institutions play an important role in developing environmental awareness in children. The aim of this research was to determine how much the educator can influence the environmental knowledge and habits related to environmental protection in children through different activities, thus encouraging the development of environmental awareness. In this research, a standardized interview with children was used as a data collection instrument. The research was conducted on a sample of 50 preschool children in two facilities (Cvjetna livada and Rudinska) of the Požega Kindergarten in Požega, in December 2022. The results of the research show that the educator encourages the development of environmental awareness in children with various activities aimed at environmental knowledge and habits related to enviromental preservation, and that there are differences in the acquisition of knowledge and habits between subjects in the control and experimental groups. Compared to the control group, the experimental group that was involved in the activities showed a significant increase in environmental knowledge and habits related to environmental group. This research contributes to research and practice aimed at raising and developing environmental awareness in early and preschool education institutions. In some future research, parental involvement in activities to encourage environmental awareness in children is also recommended.