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  Arctic 'to melt within 70 years'
Updated 02 November 2004, 14.11
Glacier
The Arctic is melting so quickly that it may disappear by 2070.

The first in-depth scientific study on how global warming is affecting the area found the ice there is half as thick as it was thirty years ago.

They say the main cause is pollution, which traps heat in earth's atmosphere, causing our temperatures to rise.

If the ice does melt, it could cause lots of extreme weather, as well as wiping out animals like polar bears which live on the glaciers.

Polar bear
Polar bears are in danger
The report has been done by an organisation called The Arctic Climate Impact Assessment.

The Arctic ice and snow also reflect a lot of heat from the sun back into space.

If it disappears, the rate of global warming would increase.

The report also points out melting ice would raise sea levels.

That would put lots of low lying cities, including London, at risk.

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