INTEGRATION OF EDUCATION FOR SUSTAINABLE DEVELOPMENT INTO SECONDARY SCHOOL CURRICULA: A REVIEW OF PEDAGOGICAL APPROACHES, TEACHER PREPAREDNESS, STUDENT ENVIRONMENTAL AWARENESS, BEHAVIORAL CHANGE OUTCOMES, AND CROSS-NATIONAL POLICY FRAMEWORKS. International Journal of Social Sciences Bulletin, [S. l.], v. 4, n. 5, p. 550–573, 2026. Disponível em: https://ijssbulletin.com/index.php/IJSSB/article/view/2285.. Acesso em: 13 may. 2026.