Tầng ozon phục hồi: Mừng hay lo?
Thông báo được Tổ chức Khí tượng thế giới WMO đưa ra hồi năm ngoái về việc lỗ thủng tầng ozon đang có xu hướng thu nhỏ lại đã khiến các nhà hoạt động môi trường rất vui mừng.
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