2018年1月24日 星期三

Is There A Ticking Time Bomb Under The Arctic?

There is more carbon in permafrost than all of the carbon humans have put in the atmosphere since the Industrial Revolution. And once it thaws, it could be a big wild card of climate change.
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.
NPR.ORG

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