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recent results from the Met Office do show that there is a detectable human impact in the long-term decline in sea ice over the past 30 years, and all the evidence points to a complete loss of summer sea ice much later this century.
http://www.metoffice.gov.uk/corporate/pressoffice/2009/pr20090211.html
I’ve long wondered how they differentiate “human impact” from natural ice cycles – which are several orders of magnitude larger than anything observed in the last 30 years. However, image processing of high resolution satellite imagery (seen below) has recently revealed an undeniable human footprint on the ice.
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