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Pen Hadow, the first man who walked to the North Pole, is leading a ground-breaking expedition to measure the thickness of the Arctic sea ice.

Green Guardian is a sponsor of the Catlin Arctic Survey, which scientists hope will provide accurate data on how fast the polar ice-caps are melting.

All pictures by Martin Hartley (c)

Catlin Arctic Survey coverage in full

The Catlin Arctic Survey team prepared for their expedition by training in the Canadian High Arctic

Scientists at Polaris Camp

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9:55am Wed 14 Jan 09

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