Page last updated at 19:51 GMT, Friday, 23 May 2008 20:51 UK

Vast cracks in Arctic ice

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Evidence of the break-up of the Arctic ice-cap has emerged from research during an expedition by the Canadian military.

Scientists travelling with troops found major new fractures in giant ice shelves in Canada's far north. David Shukman reports.

First broadcast 23 May 2008

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