I'm not a scientist so I can delve into this much, but I think this reveals a warming trend, whether this warming is man-made or not.

Exclusive: No ice at the North Pole

Polar scientists reveal dramatic new evidence of climate change
By Steve Connor, Science Editor
Friday, 27 June 2008

Independent Graphic
It seems unthinkable, but for the first time in human history, ice is on course to disappear entirely from the North Pole this year.
The disappearance of the Arctic sea ice, making it possible to reach the Pole sailing in a boat through open water, would be one of the most dramatic – and worrying – examples of the impact of global warming on the planet. Scientists say the ice at 90 degrees north may well have melted away by the summer.

"From the viewpoint of science, the North Pole is just another point on the globe, but symbolically it is hugely important. There is supposed to be ice at the North Pole, not open water," said Mark Serreze of the US National Snow and Ice Data Centre in Colorado.
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Exclusive: No ice at the North Pole - Climate Change, Environment - The Independent