This year could be worst ever for melt as data shows average sea ice extent for last month was more than half a million square kilometres smaller than the previous record of May 2012

Arctic sea ice fell to its lowest ever May extent, prompting fears that this year could beat 2012 for the record of worst ever summer sea ice melt.

Data published by the US National Snow and Ice Data Centre (NSIDC) this week showed average sea ice extent for last month was more than 500,000 sq km (193,000 sq miles) smaller than May 2012.

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Source: Guardian Environment