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How fast is Arctic sea ice melting?

updated
The Arctic's sea ice cover has reached one of its lowest ever summer minima. Karl Mathiesen, with your help, investigates. Post your views below, email karl.mathiesen.freelance@guardian.co.uk or tweet @karlmathiesen
The seven summers with the lowest minimum sea ice extents have all occurred in the last seven years.
The seven summers with the lowest minimum sea ice extents have all occurred in the last seven years. Photograph: NASA/Reuters

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