-Caveat Lector-
April 18, 2001
Thawing Permafrost Threatens Northern Hemisphere
By REUTERS
Filed at 3:49 p.m. ET
LONDON (Reuters) - Global warming is thawing permafrost in the northern
hemisphere and making large areas vulnerable to subsidence, American
researchers said on Wednesday.
The disappearance of permafrost, soil that has been below freezing point
for long periods, has accelerated in recent decades and is threatening
infrastructure in northern regions, including nuclear power stations.
``A zone in the high-risk categoryextends discontinuously around the Arctic
Ocean, indicating that there is a high potential for coastal erosion,'' said
Frederick Nelson of the Department of Geography and Center for
Climactic Research at the University of Delaware.
In a report in the science journal Nature, Nelson and his colleagues used a
mathematical model to map areas at the greatest risk.
They include populous centers in the Arctic region such as Barrow in
Alaska, Inuvik in Canada as well as Yakutsk, Noril'sk and Vorkuta in
Siberia, Russia.
The researchers said the Bilibino nuclear power stations in the Russian far
east were also in a high-risk area along with pipeline corridors in parts of
northwestern North America.
But Nelson added that changes in permafrost could be predicted and
catastrophes could be avoided by careful planning.
``Areas at risk can be partitioned into those with low, moderate or high
susceptibility to thaw-induced settlement,'' he said.
The researchers advised careful monitoring of permafrost conditions in
high priority areas near the Bering Sea and in Siberia.
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