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Italy’s side of Mont Blanc Outlet faces collapse due to climate change, say experts

Italy's side of Mont Blanc faces collapse due to climate change, say experts
Photo by Marco Bertorello / AFP
Scientists on Italy's side of the Mont Blanc massif are constantly monitoring a melting glacier, where the risk of collapse due to rising temperatures threatens the valley below.

The Planpincieux glacier, at an altitude of about 2,700 metres (8,860 feet), hangs over the hamlet of Planpincieux, underneath the south face of the Grandes Jorasses within the Mont Blanc massif in Italy’s picturesque northwest corner.

Known as a “temperate” glacier, it is already at a melting point, as opposed to polar glaciers that are still frozen to bedrock.

That means the Planpincieux glacier can slide faster, via water just under its surface, making it more unpredictable and dangerous for the Val Ferret valley below, experts say.

READ ALSO: Six shocking statistics about the climate crisis in Italy

“We’ve got a significant temperature rise and this causes a more rapid formation of the sub-glacial water flow, an important underground circulation of water,” Valerio Segor, the Aosta Valley region’s director of natural risk management, told AFP.

In years past, the Planpincieux glacier was lodged in a more stable position on the rock, and was thicker with fewer fractures, said Paolo Perret, a glacier expert at the Courmayeur-based Safe Mountains Foundation.

But due to rising temperatures caused by climate change, “the glacier withdrew to a smooth and steep surface which causes it to be in an unstable position,” Perret said.

The movements are not insignificant, with the glacier in extreme cases slipping as much as 150 centimetres (4 feet 9 inches) in a day, he said.

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By contrast, the Whymper serac, a polar glacier above it looming nearly 4,000 metres above sea level, can slide between two and 20 centimetres per day, said Perret, resulting in “imminent collapses”.

A massive block of ice from the Whymper serac measuring 15,000 square metres tumbled to the ground last October, a day after authorities had prohibited access to paths underneath.

Movements of the Planpincieux glacier – and those above it – are closely monitored via radar, and the region’s safety plan anticipates a variety of potential scenarios. 

The “extreme scenario” would be the fall of an 800,000 metre cube of ice to the village and road below, said Segor.

“But there are no absolute guarantees that it will really behave in that way.”

Photo by MASSIMO LOCCI / AFP

Elsewhere in Italy, other extreme weather events are taking place.

READ ALSO: ‘Lucifer’ heatwave fuels Italy’s wildfires with temperatures up to 47C

Regional authorities in Sicily recorded a temperature of 48.8 degrees Celsius (119.8 Fahrenheit) on Wednesday.

If validated, this would break all records for the hottest temperature ever recorded in Europe.

The scorching temperature comes amid a blistering heatwave sweeping Italy dubbed “Lucifer” this week, worsening wildfires in the south of the country, notably Sicily and Calabria.

Two people in Calabria and one in Sicily have been killed in the blazes, according to news reports.

Experts say the climate crisis is making heatwaves more frequent and more dangerous – EU data shows this year’s fire season has been significantly more destructive than the previous average.