![Pen Hadow, who is leading the Catlin Arctic Survey, addresses a news conference in London. A group of polar explorers are trekking to the North Pole this spring to gather data which Pen Hadow, who is leading the Catlin Arctic Survey, addresses a news conference in London. A group of polar explorers are trekking to the North Pole this spring to gather data which](https://c8.alamy.com/comp/GBD10B/pen-hadow-who-is-leading-the-catlin-arctic-survey-addresses-a-news-GBD10B.jpg)
Pen Hadow, who is leading the Catlin Arctic Survey, addresses a news conference in London. A group of polar explorers are trekking to the North Pole this spring to gather data which
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