The Arctic is thawing much faster than expected, scientists warn - "The degradation of ice wedges shows that upper part of permafrost is thawing, and thawing of the upper part of permafrost definitely is producing additional greenhouse gases,” he says.

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The Arctic is thawing much faster than expected, scientists warn - "The degradation of ice wedges shows that upper part of permafrost is thawing, and thawing of the upper part of permafrost definitely is producing additional greenhouse gases,” he says.