This document summarizes a project titled "Climate Volunteers" that won the 16-19 age category of the 2021 eTwinning European Prize. The project was a collaboration between students in Turkey, Romania, Moldova, and Ukraine. It had the objectives of understanding climate change, developing discussion and research skills, combating and adapting to climate change, and developing 21st century skills. Over its duration from February to June, the project involved activities such as creating communication channels between the schools, choosing a logo and slogan, creating awareness videos about climate change, discussions on forums, mind maps and posters about climate change, and producing a final collaborative magazine and song.