Is There A Ticking Time Bomb Under The Arctic?
Just what exactly is permafrost? And what is happening now that it's warming up? To find out, we enter the Arctic circle's secret world of ice and frozen history.
Đọc tiếp trên NPR
January 24, 2018 at 04:37PM
Environment
Thứ Tư, 24 tháng 1, 2018
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