Arctic sea ice melt at record level

27 August 2012 Last updated at 13:10 ET Help

More sea ice has melted in the Arctic this summer than at any time since satellite records began more than 30 years ago, scientists say.

It is thought a natural warming and cooling cycle could be responsible for up to 30% of the melting - but the rest is the result of human activity releasing greenhouse gases.

Roger Harrabin reports.

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