MILAN -- Italian officials sounded an alarm Wednesday over climate change due to the threat that a fast-moving melting glacier is posing to a picturesque valley near the Alpine town of Courmayeur.
Courmayeur mayor Stefano Miserocchi closed down a mountain road and banned access to part of the Val Ferret, a popular hiking area outside of town on the southern side of the Mont Blanc massif. Those moves came after experts warned that a 250,000-cubic-meter mass of the Planpincieux glacier was at risk of collapsing.
The glacier, which spreads 1,327 square kilometres (512 square miles) across the mountain, has been moving up to 50 centimetres (nearly 20 inches) a day.
"There are no models to tell us if it will fall entirely or in pieces," the mayor told Sky TG24. "We need to keep an eye on the monitoring."
He emphasized that even if a large chunk of the glacier collapses, no residents would be at risk, just the area of road that has been closed.
The glacier is located in the Alps on the Grande Jorasses peak of the Mont Blanc massif, which straddles the borders of Italy, France and Switzerland and contains the highest peak in Western Europe. Officials said unusually high temperatures during August and September had accelerated ice melt at the Planpincieux, which has been monitored by the Safe Mountain Foundation since 2013.
Environment Minister Sergio Costa said the emergency shows "the necessity and urgency of strong and co-ordinated action for the climate, to prevent extreme events that risk dramatic consequences."
Italian Premier Giuseppe Conte alerted world leaders to risk of the glacier's collapse during his address Tuesday to the U.N. General Assembly in New York, telling them "it is an alarm that we cannot be indifferent to."
No one has had to be evacuated in Courmayeur, town spokesman Moreno Vignolini said, adding that the closed road is used mostly to access summer homes. The mayor was meeting with residents to hear their concerns and they had some limited access to the area to check their properties.
A new special report by the Intergovernmental Panel on Climate Change said Wednesday that glaciers around the world, outside of Greenland and Antarctica but including Europe, are losing 220 billion metric tons of ice a year. The report said glacier melt is happening faster than before and is accelerating.
The report projects that if nothing is done to reduce greenhouse gas emissions, these glaciers in general will shrink 36% between now and the end of the century. But smaller glaciers, like those in the Alps, could lose up to 80% of their ice by the year 2100 in a worst-case scenario.
"Many glaciers are projected to disappear regardless of future emissions," the new science report said.
Matthias Huss, a glaciologist at ETH Zurich and head of the group Glacier Monitoring Switzerland, said the loss of glacier ice in Switzerland and Europe over the last five years has been the strongest since measurements began in the 1950s. He noted that the freezing line of 0 degree Celsius (32 degrees Fahrenheit) rose above the top of Mont Blanc this summer, "which very rarely has happened."
"We have melting at an elevation of almost 5,000 metres (16,400 feet) above sea level, which is really changing the system and can support such events as glaciers falling down," he said.
Over the last 10 years, Switzerland has lost 15% of its glacier volume, with nearly 3% loss in 2017-2018 alone, Huss said. If this trend continues, Switzerland could lose all glaciers by the year 2100 if warming continues. A change in policies could save the bigger ones, he said, but smaller ones will be lost regardless.
"We hope climate prevention measures are implemented and the warming trend is slowing down," Huss said. "If we continue as we did, then there is no rescue for the glaciers in the Alps."
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AP Science Writer Seth Borenstein contributed to this report
