Qìhòu biànnuǎn shǐ běijí de dòngtǔ kāishǐ rónghuà.
Climate warming is making the Arctic permafrost begin to thaw.
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Ground that stays frozen for years on end is permafrost, 永久冻土 'permanent frozen ground' or 多年冻土 'many-year frozen ground'. Ground that freezes only in winter is 季节性冻土 'seasonal frozen ground'.
