Validity of the ‘Dunya Hejo (Du-Jo)’ Problem-Based Learning E-Worksheet on Climate Change and Global Warming. Online Learning In Educational Research (OLER), [S. l.], v. 4, n. 2, p. 71–85, 2024. DOI: 10.58524/oler.v4i2.401. Disponível em: https://journal.foundae.com/index.php/oler/article/view/401. Acesso em: 16 jan. 2026.