Who owns the North Pole part 3

We warned here and here that due to the global warming and the increased accessibility of the Arctic Ocean and thus to the natural resources in the region that a new rivalry for sovereignty has begun in the Arctic .

Canada has announced plans for six naval patrol vessels and deep-water port in the north to assert its claim to territorial waters in the Arctic , all at a cost of $3bn (£1.5bn) .

Prime Minister Stephen Harper says the time has come to re-assert Canada's claim to the north to remind other countries - including the US - of Canada's claim to the waters off its northern coast.

The claim could also have serious economic implications. Natural resources including oil, gas and diamonds are thought to lurk - perhaps in abundance - under the Arctic ice. And then there is the North-West Passage - the northern shipping route between the Atlantic and Pacific oceans that European explorers sought for centuries. With a warming climate, the route may just become viable and lucrative.