Melting of Mountain Glaciers is Accelerating

Mountain glaciers are retreating three times faster than they were in the 1980s, says the World Glacier Monitoring Service.

On average, they lost about 66 centimetres in depth in 2005, according to the latest report from the UN-affiliated body, released on 30 January. This loss rate is 1.6 times more than the annual average for the 1990s and three times the 1980s average.

While the rate of change is certainly alarming, it is not a surprise, says Michael Zemp of WGMS. He says it fits in with the accelerating trend of the past 25 years, and simply serves to "make it sharper".

The truly worrying observation, he says, comes when the past 150 years are analysed in the context of the past 10,000 years of glacial history. Mountain glaciers reached their maximum extent for 10,000 years in 1850. But since then they have lost 50% of their area and retreated to their minimum extent for 10,000 years.