“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, vol. 4, no. 5, May 2026, pp. 550-73, https://ijssbulletin.com/index.php/IJSSB/article/view/2285.