Remember 2007, when the Arctic was going to be ice-free by 2012? Now that's been pushed back until 2030

Arctic may be ice-free within 30 years | Environment | guardian.co.uk

In the past 10 days, the Arctic ocean has been losing as much as 150,000 square kilometres of sea a day, said Mark Serreze, director of the NSIDC.

"The extent [of the ice cover] is going down, but it is also thinning. So a weather pattern that formerly would melt some ice, now gets rid of much more. There will be ups and downs, but we are on track to see an ice-free summer by 2030. It is an overall downward spiral."
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What concerns polar scientists is that thicker ice which does not melt in the summer is not being formed fast as the ice is melting. On average each year about half of the first year ice, formed between September and March, melts during the following summer.

Global Warming & Terra Forming Terra: Nasa wakes up and predicts 2012 as ice free

[2007] WASHINGTON (AP) -- An already relentless melting of the Arctic greatly accelerated this summer, a warning sign that some scientists worry could mean global warming has passed an ominous tipping point. One even speculated that summer sea ice would be gone in five years.