ICE FREE BY 2013

And as the melting polar ice makes the Arctic more accessible to ships, several countries are scrambling to claim jurisdiction in the area.

"The economic interests are reflected in ... competing claims by relevant stakeholders, and resumed military presence in the area," NATO said on its Web site. "As it is a region of enduring strategic importance for NATO and allied security, developments in the High North require careful and ongoing examination."

The U.S. Geological Survey estimates that 90 billion barrels of oil, 44 billion barrels of natural gas liquids and 1,670 trillion cubic feet of natural gas are recoverable in the frozen region north of the Arctic Circle.

At the same time, Arctic water is warming so quickly that the entire region could be ice-free by 2013.

Already Russia, Canada, the United States, Denmark, Norway, Sweden, Iceland and Finland are fighting to lay claim to the Arctic's icy real estate.

According to the U.N. Convention on the Law of the Sea, countries are entitled to exclusive economic zones up to 200 miles from their shores. But some countries are trying to extend that zone.

Russian scientists want to prove the seabed below the North Pole is part of the Eurasian continental shelf, an area called the Lomonosov Ridge.

If that is the case, the region would be under Russian control. Moscow argued before a U.N. commission in 2001 that the ridge is an extension of its continental territory. But the United Nations asked for more evidence.

Danish scientists are trying to prove that the Lomonosov Ridge is connected to Greenland, and Canadian scientists are looking for links between the ridge and Ellesmere Island, a Canadian territory.