Tundra burning may also release more organic carbon, a greenhouse gas currently stored in the soil, into the atmosphere.

苔原燃烧也可能释放出更多的有机的碳，二氧化碳目前储存在土壤中，这样将会到大气层中。

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Ice wedges penetrate deep into frozen soil, chiseling tundra into room-size polygon-a signature texture of permafrost landscapes.

冰楔可以深深穿入冰冻的土壤，将冻原雕凿成一个个如房间大小的多角地裂块，是永冻层景观的一个特征。

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The episode is known as the Younger Dryas, because in Scandinavia abundant pollen from a tundra flower called the mountain avens, Dryas octopetala, reappears in soil from this date, indicating that the forest had once more given way to tundra.

WSJ: Matt Ridley on New Support for a Global-Cooling Theory | Mind & Matter