This document summarizes an eTwinning collaborative project between a primary school in Greece and one in Spain on the topic of environmental protection. The project involved students from both schools participating in activities together online and in person to raise environmental awareness, including presenting information on their cities and schools, creating a mascot, writing a song, and holding a joint celebration on World Environment Day. Evaluations found that the program successfully promoted cooperation between the schools, improved students' language skills, and increased their understanding of environmental issues.