1. Environmental Education Center of Grevena, End of Taliadouri Str, Grevena, Greece
2. Department of Early Childhood Education, Faculty of Education, Aristotle University of Thessaloniki, Thessaloniki, Greece
3. Department of Primary Education, Faculty of Education, Aristotle University of Thessaloniki, Thessaloniki, Greece
4. Department of Forestry and Natural Environment, Faculty of Agriculture, Forestry and Natural Environment, Aristotle University of Thessaloniki, Lamia, ΤΚ, Greece