The research initially delves into the outcomes of an international eTwinning project focused on heightening awareness among future primary school teachers about the causes and consequences of climate change within the framework of sustainable environmental education1 . Employing qualitative research methodologies, the investigation took the form of a case study. The participant group consisted of 13 pre-service teachers studying at Mersin and Balıkesir Universities in Turkey as well as the University of Palermo in Italy in the academic year 2021- 2022. Researchers utilized a semi-structured interview format crafted specifically for the study. The objectives encompassed enhancing the understanding of pre-service teachers regarding sustainable environmental education, fostering their familiarity with eTwinning to enable crosscultural interaction with other European pre-service teachers. Furthermore, emphasis was placed on elevating pre-service teachers' awareness about foreign language utilization and the integration of information and communication technology (ICT)2 . Keywords: pre-service primary school teachers; eTwinning; sustainable development; environmental education.