Đến năm 2040, Bắc Cực sẽ không còn băng?
Một nghiên cứu khí hậu gần đây cho biết nếu lượng khí thải gây hiệu ứng nhà kính tiếp tục được thải vào không khí ở mức như hiện nay, đa số các chỗ trũng ở Bắc Cực sẽ không còn băng vào tháng 9-2040; và vào mùa đông, băng ở đây chỉ còn dày chưa tới 1m, so với 3,6 m hiện nay.
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