Here are some projectsions on just one aspect of the subject:
"According to these models, there will be no sea ice left in the summer in the Arctic Ocean somewhere between 2010 and 2015". “And it’s probably going to happen even faster than that,” Professor Louis Fortier - Université Laval, Director ArcticNet - November 16, 2007
NASA climate scientist Jay Zwally said: “At this rate, the Arctic Ocean could be nearly ice-free at the end of summer by 2012, much faster than previous predictions. - National Geographic Dec. 12, 2007
Scientists in the US have presented one of the most dramatic forecasts yet for the disappearance of Arctic sea ice. Their latest modelling studies indicate northern polar waters could be ice-free in summers within just 5-6 years. Professor Wieslaw Maslowski told an American Geophysical Union meeting that previous projections had underestimated the processes now driving ice loss. "Our projection of 2013 for the removal of ice in summer is not accounting for the last two minima, in 2005 and 2007," the researcher from the Naval Postgraduate School, Monterey, California, explained to the BBC. "So given that fact, you can argue that may be our projection of 2013 is already too conservative." Professor Maslowski's group, which includes co-workers at Nasa and the Institute of Oceanology, Polish Academy of Sciences (PAS), is well known for producing models that are in advance of other teams. - BBC Dec. 12, 2007
Arctic warming has become so dramatic that the North Pole may melt this summer (2008), report scientists studying the effects of climate change in the field. "We're actually projecting this year that the North Pole may be free of ice for the first time [in history]," David Barber, of the University of Manitoba, told National Geographic News aboard the C.C.G.S. Amundsen, a Canadian research icebreaker. - National Geographic News June 20, 2008
“There is a possibility of an ice-free Arctic Ocean for a short period in summer perhaps as early as 2015. This would mean the disappearance of multi-year ice, as no sea ice would survive the summer melt season….Arctic Marine Shipping Assessment Report – 2009
“It could even be this year or next year but not later than 2015 there won’t be any ice in the Arctic in the summer,” - David Vaughan Glaciologist & IPCC scientist - Financial Times Magazine Aug 8, 2012