NASA Scientists See New Signs of Global Warming
Scientists have long suspected that the recent melting of Arctic Ocean ice in the summer might be a result of heat-trapping gases. But recently NASA scientists reported that higher temperatures and a retreat of the sea ice over the last two winters offered new evidence that the gases were influencing the region’s climate, according to the New York Times.

While the summer melting could be a result of a number of phenomena like the flow of warm water, the scientists said, the reduction of winter ice two seasons in a row is harder to find an explanation other than the human-caused warming.
In the past two winters, the peak of sea ice growth in the Arctic has been 6 percent below the average peak since the satellite observations began. Some Arctic experts say the most open water in the Arctic in a century probably happened last year.

Jin Yanni

(Resource: http://www.nytimes.com/2006/09/14/science/earth/14climate.html?_r=1&ref=environment&oref=slogin