Elena Lehtimäki, MSc, has almost 20 years of experience in environmental education. Her expertise is in the circular economy, sustainable consumption and water issues. She has worked with children of all ages and taught hundreds of lessons from kindergarten groups to young adults. Elena has also trained early childhood educators and teachers on sustainable development topics. She has an environmental background, and through her work she has developed strong pedagogical skills and has also been trained as a teacher. As a sustainability education pioneer she has produced a wide range of teaching materials. In recent years, she has focused on designing and implementing online teaching and learning games with her team.