DR. RANI ERUM, PROF. DR SAYEDA DAUD. GLOBAL ENVIRONMENTAL CHALLENGES AND THEIR EFFECTS IN 21st CENTURY A CASE STUDY OF USA. Pakistan Journal of International Affairs, [S. l.], v. 4, n. 1, 2021. DOI: 10.52337/pjia.v4i1.125. Disponível em: https://pjia.com.pk/index.php/pjia/article/view/125. Acesso em: 14 sep. 2026.