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The strait is the exit route from the Arctic Ocean, a current carrying the floes south into the Atlantic.
BBC: The 'big melt' at the roof of the world
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This is broadly similar to the 1979-2000 average of 7.04 million sq km observed by modern satellites, and the number used to judge current behaviour in the Arctic.
BBC: Earliest satellite maps of Antarctic and Arctic sea-ice
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The current warming being experienced in the Arctic means the conditions needed to rebuild the shelves simply does not exist.
BBC: Canadian Arctic sheds ice chunk
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In addition to a sea floor mapping project, the researchers will make chemical analyses of water samples that will help them determine the temperature, salinity and composition of a strong circumpolar current that flows around the boundary of the Arctic Ocean.
CNN: Nuclear sub dives under the ice to explore climate change
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The current transports water from the Atlantic and Pacific Oceans throughout the Arctic, said Tom Weingartner, a marine scientist at the University of Alaska, Fairbanks.
CNN: Nuclear sub dives under the ice to explore climate change
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As far as current global observations are concerned, Hansen cites both the decline of Arctic sea ice and the worldwide retreat of mountain glaciers as causes for major concern.
CNN: Carbon dioxide levels already a danger
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"This suggests that current model projections may in fact provide a conservative estimate of future Arctic change, and that the summer Arctic sea ice may disappear considerably earlier than IPCC projections, " said NSIDC's Julienne Stroeve who led the study.
CNN: Arctic melt worse than predictions
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These new sources can be within the current fields (think fracking in oil), as yet undiscovered fields (the Arctic), or previously known fields where technology now enables access (deep-sea extraction).
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