The Earth Charter represents the philosophy and ethics necessary to create a new period of human civilization. Understanding and adoption of this new vision is the most important mission of education for sustainable development (ESD). This article argues that for successful implementation of ESD principles at school, the school education system should be changed into a resource centre that initiates and supports students' inclusion into processes of sustainable development in their own communities. Teachers' self-definition as co-learners in the educational process is an essential part of this change. Moreover, in many instances the integration of nonformal educational initiatives led by youth into the formal educational system makes the transition to ESD more effective and sustainable. By introducing the activities of Youth International Education Club NEWLINE (Belarus), the authors provide examples of nonformal educational tools and methods implemented in several Belarusian schools.