Khí hậu toàn cầu thay đổi bởi một ngọn núi lửa
Cách đây 4 thế kỷ, một ngọn núi lửa ở Peru phun những cột khói bụi khổng lồ lên bầu trời. Thảm họa ấy có thể đã mở đầu một giai đoạn mới trong lịch sử khí hậu thế giới.
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