Trái Đất trải qua thời kỳ nóng nhất trong 1.400 năm
Cập nhật: 09:41 25/04/2013 GMT+7
Bề mặt Trái Đất đã chạm nền nhiệt trung bình ấm nhất vào cuối thế kỷ 20, thời điểm được cho là nóng nhất trong vòng 1.400 năm qua.
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