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Summer ice in Arctic 'will be gone in under five years'

Scientists fear global warming has passed an ominous tipping point after new Nasa satellite data showed the already relentless melting of the Arctic increased greatly during the Northern Hemisphere�s hot summer months.

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heraldscotland staff

Colorado

Scientists fear global warming has passed an ominous tipping point after new Nasa satellite data showed the already relentless melting of the Arctic increased greatly during the Northern Hemisphere's hot summer months.