Icy evidence
The Far North is showing much more dramatic evidence of climate warming than other places around the world. But why? In Siberia, permafrost (ground which stays frozen all year) contains much more ice than in other regions such as Alaska. Between 50 and 90% of Siberia's permafrost, known as yedoma, is peppered with solid blocks of ice, unchanged since the last ice age.
'These massive wedges of black ice, over 7 metres thick, are embedded in the surface of permafrost that is as deep as New York's Empire State Building is tall.' Katey Walter, climate scientist, University of Alaska Fairbanks
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Along lake banks like this, light grey wedges of ice are separated by darker stripes of soil.
Image: Katey Walter |
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