Papotnik, A. (2009). PROBLEMS ENVIRONMENTAL EDUCATION CONNECTED WITH TECHNIC AND TECHNOLOGY. Problems of Education in the 21st Century , Problems of Education in the 21st Century , 14. presented at the October/2009. Retrieved from http://oaji.net/articles/2014/457-1393668671.pdf

Keinonen, T., & Kärkkäinen, S. (2010). UNIVERSITY STUDENTS’ ARGUMENTATION IN SCIENCE AND ENVIRONMENTAL EDUCATION. Problems of Education in the 21st Century , Problems of Education in the 21st Century , 22. presented at the June/2010. Retrieved from http://oaji.net/articles/2014/457-1400515358.pdf

Dzurišinová, Z., & Prokša, M. (2011). ANALYSIS OF EXPERIENCE IN ENVIRONMENTAL PROJECT TEACHING USING ESSAY AS A FEEDBACK. Problems of Education in the 21st Century, Problems of Education in the 21st Century, 35. presented at the November/2011. Retrieved from http://journals.indexcopernicus.com/abstract.php?icid=968801

Kärkkäinen, S. (2012). HOW DO ANIMALS SPEND THE WINTER? A FINNISH STUDY ON THE USE OF VEE HEURISTICS IN A BIOLOGY UNIT FOR EIGHTH GRADERS. Problems of Education in the 21st Century, Problems of Education in the 21st Century, 47. presented at the November/2012. doi:https://doi.org/10.33225/pec/12.47.69

Kärkkäinen, S., Haukipuro, L., Rummukainen, A. - M., Keinonen, T., & Simola, H. (2013). ENVIRONMENTAL RESPONSIBILITY: A CASE STUDY AMONG SIXTH GRADERS. Problems of Education in the 21st Century, Problems of Education in the 21st Century, 54. presented at the June/2013. doi:https://doi.org/10.33225/pec/13.54.22

Silva, M. J., Lopes, J. B., & Silva, A. A. (2013). USING SENSES AND SENSORS IN THE ENVIRONMENT TO DEVELOP ABSTRACT THINKING – A THEORETICAL AND INSTRUMENTAL FRAMEWORK. Problems of Education in the 21st Century, Problems of Education in the 21st Century, 53. presented at the April/2013. doi:https://doi.org/10.33225/pec/13.53.99

Mika, J., & Farkas, A. (2017). ON SYNERGIES AND CONFLICTS BETWEEN THE SUSTAINABLE DEVELOPMENT GOALS (2016-2030) AND RENEWABLE ENERGY SOURCES FOR EDUCATION OF AND BY SUSTAINABILITY. Problems of Education in the 21st Century, Problems of Education in the 21st Century, 75(2), Continuous. presented at the April/2017. doi:https://doi.org/10.33225/pec/17.75.182

Ige, O. A., Jita, L. C., & Jita, T. (2019). MAJOR PERSONALITY TRAITS INFLUENCING ENVIRONMENTAL KNOWLEDGE: A CASE OF URBAN LEARNING ECOLOGIES. Problems of Education in the 21st Century, Problems of Education in the 21st Century, 77(1), Continuous. presented at the February/2019. doi:https://doi.org/10.33225/pec/19.77.39

Horak, R., Major, L., Halasi, S., Vukov Raffai, E., Samu, J., & Pinter Krekic, V. (2025). SUSTAINABILITY EDUCATION AND ENVIRONMENTAL ATTITUDES IN MINORITY TEACHER TRAINING: A CASE FROM SERBIA. Problems of Education in the 21st Century, Problems of Education in the 21st Century, 83(6), continuous. presented at the December/2025. doi:https://doi.org/10.33225/pec/25.83.766

Lamanauskas, V. (2026). ENVIRONMENTAL EDUCATION IN PRESCHOOL AGE AS AN EDUCATIONAL PRIORITY. Problems of Education in the 21st Century, Problems of Education in the 21st Century, 84(2), Continuous. presented at the April/2026. doi:https://doi.org/10.33225/pec/26.84.254