Bắc cực ấm lên tới mức báo động
Ngày 14/3, Trung tâm dữ kiện băng tuyết Mỹ (NSIDC) cảnh báo, sự ấm lên của Bắc cực có thể đã đến mức không thể đảo ngược. Hai mùa Đông liên tiếp, ở Bắc cực chỉ có băng tan nhưng không hình thành băng mới.
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