This paper analyses a part of the results regarding environmental education (EE) and education for sustainable development (ESD) in Romania, obtained by administering a survey in 2017, willingly and anonymously filled out by 335 teachers (preschool teachers, primary school teachers, Geography teachers). It examines: respondents' interest, importance, knowledge and involvement in EE and sustainable development (SD); activity impact on teacher knowledge, attitude and behaviour towards SD and environment in Romania; importance of aims and levels in EE and ESD; EE and SD activities involving preschoolers and pupils as well as their frequency; the efficiency of some activities in preschoolers' and pupils' EE and ESD; problems that may occur due to a subpar EE. In its conclusions, the paper highlights several measures for an increase in EE and ESD levels.