“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” (2026) International Journal of Social Sciences Bulletin, 4(5), pp. 550–573. Available at: https://ijssbulletin.com/index.php/IJSSB/article/view/2285 (Accessed: 13 May 2026).