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Last Updated: Monday April 04 2011 16:35 GMT

Mountain glacier melt 'fastest in 350 years'

Perito Moreno glacier in South America

Melting mountain glaciers are making sea levels rise at the fastest rate in 350 years.

Scientists have looked at how 270 of the largest glaciers in South America's Andes mountains have changed over time.

Their study went back hundreds of years to the "Little Ice Age", when glaciers were much bigger.

They found that glaciers have been shrinking much faster in the past 30 years - and the melted water is making sea levels rise quicker too.