But that, experts warn, brings with it a rising risk of environmental disaster not to mention criminal activity from illegal fishing to smuggling and terrorism. This summer will see more human activity in the Arctic than ever before, with oil giant Shell engaged in major exploration and an expected further rise in fishing, tourism and regional shipping. If, as many scientists predict, currently inaccessible sea lanes across the top of the world become navigable in the coming decades, they could redraw global trading routes - and perhaps geopolitics - forever. A member of a team of Cambridge scientists trying to find out why Arctic sea ice is melting so fast, walks on some drift ice 500 miles (800 km) from the North Pole September 3, 2011.
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