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Permafrost is a thermal condition -- its formation, persistence and
disappearance are highly dependent on climate. General circulation
models predict that, for a doubling of atmospheric concentrations
of carbon dioxide, mean annual air temperatures may rise up to
several degrees over much of the Arctic. In the discontinuous
permafrost region, where ground temperatures are within 1-2 degrees
of thawing, permafrost will likely ultimately disappear as a result
of ground thermal changes associated with global climate warming.
Where ground ice contents are high, permafrost degradation will
have associated physical impacts. Permafrost thaw stands to have
wide-ranging impacts, such as the draining and drying of the
tundra, erosion of riverbanks and coastline, and destabilization of
infrastructure (roads, airports, buildings, etc.), and including
potential implications for ecosystems and the carbon cycle in the
high latitudes.
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