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The rate at which some of the world's glaciers are melting has more than doubled, data from the United Nations Environment Programme has shown.

Average glacial shrinkage has risen from 30 centimetres per year between 1980 and 1999, to 1.5 metres in 2006.

Some of the biggest losses have occurred in the Alps and Pyrenees mountain ranges in Europe.

Experts have called for "immediate action" to reverse the trend, which is seen as a key climate change indicator.

Estimates for 2006 indicate shrinkage of 1.4 metres of 'water equivalent' compared to half a metre in 2005.

Achim Steiner, Under-Secretary General of the UN and executive director of its environment programme (UNEP), said: "Millions if not billions of people depend directly or indirectly on these natural water storage facilities for drinking water, agriculture, industry and power generation during key parts of the year.

"There are many canaries emerging in the climate change coal mine. The glaciers are perhaps among those making the most noise and it is absolutely essential that everyone sits up and takes notice...