From the Independent:
Although not a prediction supported by all climate change scientists, Professor Peter Wadhams of Cambridge University believes we could see the area of sea ice in the Arctic reduced to one of less than one million square kilometres in September this year and completely free within the next few years.
Provisional satellite data produced by the US National Snow & Ice Data Centre shows there were just over 11.1 million square kilometres of sea ice on 1 June this year, compared to the average for the last 30 years of nearly 12.7 million square kilometres. This reduction is roughly the equivalent of six times the area of the UK and means that we could be on track for the Arctic to be totally free of ice this September - if so this will be for the first time for 100,000 years.
Professor Wadhams explains in this YouTube video how his 'boots on the ground' research in the Arctic has indicated that climate change will be abrupt in various regions due to this melting of sea ice in the Arctic.
His view contradicts the IPCC model which predicts a gradual and even progression worldwide. In the Northern Hemisphere, in particular, this change will be exagerrated because of this quicker than expected melting in the Arctic.