Page last updated at 15:39 GMT, Thursday, 5 March 2009

A dramatic night on Arctic ice

A British team has begun a gruelling trek to the North Pole to discover how quickly the Arctic sea-ice is melting.

During their 1,000km (620 miles) journey they plan to take measurements of the thickness of the ice.

Polar explorer Ann Daniels describes a dramatic night on the Arctic sea ice.


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