He warns that the Arctic Ocean could be free of ice during future Northern Hemisphere summers.

VOA: special.2009.10.27

This week,we will tell the latest about sea ice in the Arctic Ocean.

VOA: special.2009.10.27

The bear he says brings that message home. "It gives people an opportunity to connect with literally the processes that are going on up on the sea ice of the Arctic Ocean around the North Pole which is melting,"

VOA: standard.2009.12.13

Thanks to data collected and disseminated by the Arctic Regional Ocean Observing System (Arctic ROOS) and by national observing efforts, information about the extent of the Arctic sea ice is reported every few days, providing an early warning of changing conditions in the Arctic Ocean.

UNESCO: EDUCATION

The Geographic pole is the top of the axis on which the earth spins, the Magnetic pole is where the compass points to, and the Arctic pole is the point on the Arctic Ocean furthest from any land.

BBC: NEWS | UK | British man scores polar success

More recently, his techniques have begun to reveal how the changing ice cover might affect the interaction between the Arctic Ocean and the atmosphere.

BBC: Cryosat spots Arctic sea-ice loss in autumn