Thermokarst failures occur when permafrost—a layer of frozen soil in Earth's polar regions—thaws and becomes unstable, possibly releasing greenhouse gases into the atmosphere.
随着永久冻土带消溶和
崩离析，热喀斯特
象大量
，
藏于地下的（甲烷等）温室气体可
散发到大气中。
Thermokarst failures occur when permafrost—a layer of frozen soil in Earth's polar regions—thaws and becomes unstable, possibly releasing greenhouse gases into the atmosphere.
随着永久冻土带消溶和崩离析，热喀斯特象大量，藏于地下的（甲烷等）温室气体可散发到大气中。
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