Climate activists from the group 'Derniere Renovation' block the access road to the Mont-Blanc tunnel to protest the lack of international action at the COP15, the two-week U.N. Biodiversity summit, in Chamonix, France December 9, 2022. REUTERS/Denis Balibouse 

Gendarmerie members remove 'Derniere Renovation' climate activists who chained themselves to block the access road to the Mont-Blanc tunnel in protest of the lack of international action at the COP15, the two-week U.N. Biodiversity summit, in Chamonix, France December 9, 2022. REUTERS/Denis Balibouse 

Gendarmerie members remove 'Derniere Renovation' climate activists who chained themselves to block the access road to the Mont-Blanc tunnel in protest of the lack of international action at the COP15, the two-week U.N. Biodiversity summit, in Chamonix, France December 9, 2022. REUTERS/Denis Balibouse 

Gendarmerie members remove a 'Derniere Renovation' climate activist who blocked the access road to the Mont-Blanc tunnel to protest the lack of international action at the COP15, the two-week U.N. Biodiversity summit, in Chamonix, France December 9, 2022. REUTERS/Denis Balibouse 

Gendarmerie members remove a 'Derniere Renovation' climate activist who blocked the access road to the Mont-Blanc tunnel to protest the lack of international action at the COP15, the two-week U.N. Biodiversity summit, in Chamonix, France December 9, 2022. REUTERS/Denis Balibouse 

Gendarmerie members remove a 'Derniere Renovation' climate activist who blocked the access road to the Mont-Blanc tunnel to protest the lack of international action at the COP15, the two-week U.N. Biodiversity summit, in Chamonix, France December 9, 2022. REUTERS/Denis Balibouse 

Gendarmerie members stand around climate activists from the group 'Derniere Renovation' who blocked the access road to the Mont-Blanc tunnel to protest the lack of international action at the COP15, the two-week U.N. Biodiversity summit, in Chamonix, France December 9, 2022. REUTERS/Denis Balibouse 

Gendarmerie members stand next to climate activists from the group 'Derniere Renovation' who blocked the access road to the Mont-Blanc tunnel to protest the lack of international action at the COP15, the two-week U.N. Biodiversity summit, in Chamonix, France December 9, 2022. REUTERS/Denis Balibouse 

Gendarmerie members remove a 'Derniere Renovation' climate activist who blocked the access road to the Mont-Blanc tunnel to protest the lack of international action at the COP15, the two-week U.N. Biodiversity summit, in Chamonix, France December 9, 2022. REUTERS/Denis Balibouse 

Gendarmerie members remove 'Derniere Renovation' climate activists who blocked the access road to the Mont-Blanc tunnel to protest the lack of international action at the COP15, the two-week U.N. Biodiversity summit, in Chamonix, France December 9, 2022. REUTERS/Denis Balibouse 

Climate activists from the group 'Derniere Renovation' are chained as they block the access road to the Mont-Blanc tunnel to protest the lack of international action at the COP15, the two-week U.N. Biodiversity summit, in Chamonix, France December 9, 2022. REUTERS/Denis Balibouse 

Climate activists from the group 'Derniere Renovation' block the access road to the Mont-Blanc tunnel to protest the lack of international action at the COP15, the two-week U.N. Biodiversity summit, in Chamonix, France December 9, 2022. REUTERS/Denis Balibouse 

Climate activists from the group 'Derniere Renovation' block the access road to the Mont-Blanc tunnel to protest the lack of international action at the COP15, the two-week U.N. Biodiversity summit, in Chamonix, France December 9, 2022. REUTERS/Denis Balibouse 

Climate activists from the group 'Derniere Renovation' block the access road to the Mont-Blanc tunnel to protest the lack of international action at the COP15, the two-week U.N. Biodiversity summit, in Chamonix, France December 9, 2022. REUTERS/Denis Balibouse 

Climate activists from the group 'Derniere Renovation' block the access road to the Mont-Blanc tunnel to protest the lack of international action at the COP15, the two-week U.N. Biodiversity summit, in Chamonix, France December 9, 2022. REUTERS/Denis Balibouse 

Climate activists from the group 'Derniere Renovation' block the access road to the Mont-Blanc tunnel to protest the lack of international action at the COP15, the two-week U.N. Biodiversity summit, in Chamonix, France December 9, 2022. REUTERS/Denis Balibouse 

Climate activists from the group 'Derniere Renovation' block the access road to the Mont-Blanc tunnel to protest the lack of international action at the COP15, the two-week U.N. Biodiversity summit, in Chamonix, France December 9, 2022. REUTERS/Denis Balibouse TPX IMAGES OF THE DAY 

Climate activists from the group 'Derniere Renovation' block the access road to the Mont-Blanc tunnel to protest the lack of international action at the COP15, the two-week U.N. Biodiversity summit, in Chamonix, France December 9, 2022. REUTERS/Denis Balibouse 

Climate activists from the group 'Derniere Renovation' block the access road to the Mont-Blanc tunnel to protest the lack of international action at the COP15, the two-week U.N. Biodiversity summit, in Chamonix, France December 9, 2022. REUTERS/Denis Balibouse 

Climate activists from the group 'Derniere Renovation' are chained at the entrance of the Mont-Blanc tunnel to protest the lack of international action at the COP15, the two-week U.N. Biodiversity summit, in Chamonix, France December 9, 2022. REUTERS/Denis Balibouse 

The Mont Blanc mountain is seen from Finhaut, Switzerland, August 4, 2022. REUTERS/Denis Balibouse 

A view of the Mont Blanc mountain from Le Brevent, in Chamonix, France, June 14, 2022. REUTERS/Denis Balibouse 

Tourists look at the view in front of the Mont Blanc mountain at Le Brevent in Chamonix, France, June 14, 2022. REUTERS/Denis Balibouse 

Tourists look at the view in front of the Mont Blanc mountain at Le Brevent in Chamonix, France, June 14, 2022. REUTERS/Denis Balibouse 

A tourist takes a picture in front of the Mont Blanc mountain at Le Brevent in Chamonix, France, June 14, 2022. REUTERS/Denis Balibouse 

A man sunbaths near Lake Leman with the Mont Blanc mountain in the background in Geneva, Switzerland, June 12, 2022. REUTERS/Denis Balibouse 

A view of the Bionnassay glacier, the smallest glacier of the Mont Blanc complex in France, which is shrinking under the the influence of global warming, according to many scientists, August 18, 2021. REUTERS/Yann Tessier 

A view of the Bionnassay glacier, the smallest glacier of the Mont Blanc complex in France, which is shrinking under the the influence of global warming, according to many scientists, August 18, 2021. REUTERS/Yann Tessier 

A hiker walks past the Bionnassay glacier, the smallest glacier of the Mont Blanc complex in France, which is shrinking under the the influence of global warming, according to many scientists, August 18, 2021. REUTERS/Yann Tessier 

A pharmacy thermometer shows a temperature of 31 degrees Celsius (87.8F), in the foothills of the Mont Blanc massif (background), Europe's tallest mountain, in Chamonix, France, August 14, 2021. REUTERS/Yann Tessier 

A pharmacy thermometer shows a temperature of 32 degrees Celsius (89.6F), in the foothills of the Mont Blanc massif (background), Europe's tallest mountain, in Chamonix, France, August 14, 2021. REUTERS/Yann Tessier 

The town of Chamonix and the Drus mountains in the Massif du Mont Blanc are pictured in France, June 26, 2021. Picture taken June 26, 2021 through a window. REUTERS/Denis Balibouse 

The Mont Blanc, Aiguille du Midi and Glacier des Bossons are pictured in Chamonix, France, June 26, 2021. Picture taken June 26, 2021 through a window. REUTERS/Denis Balibouse 

The town of Chamonix in the Massif du Mont Blanc is pictured in France, June 26, 2021. Picture taken June 26, 2021 through a window. REUTERS/Denis Balibouse 

Maxime Pinot of France flies in front of Mont Blanc at half way during the Red Bull X-Alps, a 1238 km race across the Alps by foot and paraglider from Salzburg to Mt Blanc and back to Zell am See via 12 turn points in five countries, in Chamonix, France, June 26, 2021. REUTERS/Denis Balibouse 

Christian "Chrigel" Maurer of Switzerland (red wing) competes with Maxime Pinot of France in front of Mont Blanc at half way during the Red Bull X-Alps, a 1238 km race across the Alps by foot and paraglider from Salzburg to Mt Blanc and back to Zell am See via 12 turn points in five countries, in Chamonix, France, June 26, 2021. REUTERS/Denis Balibouse 

Christian "Chrigel" Maurer of Switzerland (red wing) competes with Maxime Pinot of France in front of Mont Blanc at half way during the Red Bull X-Alps, a 1238 km race across the Alps by foot and paraglider from Salzburg to Mt Blanc and back to Zell am See via 12 turn points in five countries, in Chamonix, France, June 26, 2021. REUTERS/Denis Balibouse 

Christian "Chrigel" Maurer of Switzerland (red wing) competes with Maxime Pinot of France in front of Mont Blanc at half way during the Red Bull X-Alps, a 1238 km race across the Alps by foot and paraglider from Salzburg to Mt Blanc and back to Zell am See via 12 turnpoints in five countries, in Chamonix, France, June 26, 2021. REUTERS/Denis Balibouse 

Christian "Chrigel" Maurer of Switzerland (red wing) competes with Maxime Pinot of France in front of Mont Blanc at half way during the Red Bull X-Alps, a 1238 km race across the Alps by foot and paraglider from Salzburg to Mt Blanc and back to Zell am See via 12 turn points in five countries, in Chamonix, France, June 26, 2021. REUTERS/Denis Balibouse 

Christian "Chrigel" Maurer of Switzerland (red wing) competes with Maxime Pinot of France in front of Mont Blanc at half way during the Red Bull X-Alps, a 1238 km race across the Alps by foot and paraglider from Salzburg to Mt Blanc and back to Zell am See via 12 turnpoints in five countries, in Chamonix, France, June 26, 2021. REUTERS/Denis Balibouse 

Christian "Chrigel" Maurer of Switzerland (red wing) competes with Maxime Pinot of France in front of Mont Blanc at half way during the Red Bull X-Alps, a 1238 km race across the Alps by foot and paraglider from Salzburg to Mt Blanc and back to Zell am See via 12 turn points in five countries, in Chamonix, France, June 26, 2021. REUTERS/Denis Balibouse 

Christian "Chrigel" Maurer of Switzerland flies in front of the Mont Blanc at half way during the Red Bull X-Alps, a 1238 km race across the Alps by foot and paraglider from Salzburg to Mt Blanc and back to Zell am See via 12 turnpoints in five countries, in Chamonix, France, June 26, 2021. REUTERS/Denis Balibouse 

A Swiss flag is pictured on the Mont-Blanc bridge, amid the coronavirus disease (COVID-19) pandemic, in Geneva, Switzerland, March 8, 2021. Picture taken March 8, 2021. REUTERS/Denis Balibouse 

The Mont-Blanc mountain is seen on an autumn morning above a sea of clouds in Gimel, Switzerland November 6, 2020 Picture taken with a drone. REUTERS/Denis Balibouse 

Alpinists make their way across a glacier on the Italian side of Mont Blanc massif in Courmayeur, Italy, September 3, 2020. REUTERS/Lisi Niesner 

Alpinists make their way across a glacier on the Italian side of Mont Blanc massif in Courmayeur, Italy, September 3, 2020. REUTERS/Lisi Niesner TPX IMAGES OF THE DAY 

Alpinists make their way across a glacier on the Italian side of Mont Blanc massif in Courmayeur, Italy, September 3, 2020. REUTERS/Lisi Niesner 

Rifugio Torino alpine shelter is seen on the Italian side of Mont Blanc massif in Courmayeur, Italy, September 3, 2020. REUTERS/Lisi Niesner 

Alpinists make their way across a glacier on the Italian side of Mont Blanc massif in Courmayeur, Italy, September 3, 2020. REUTERS/Lisi Niesner 

Visitors wear protective masks as they ride Skyway cable car in front of Mont Blanc massif in Courmayeur, Italy, September 3, 2020. REUTERS/Lisi Niesner 

Visitors wear protective masks as they ride Skyway cable car in front of Mont Blanc massif in Courmayeur, Italy, September 3, 2020. REUTERS/Lisi Niesner 

The Bossons Glacier of the Mont-Blanc massif is pictured in Chamonix, France, July 20, 2020. REUTERS/Denis Balibouse 

The Bossons Glacier of the Mont-Blanc massif is pictured in Chamonix, France, July 20, 2020. REUTERS/Denis Balibouse 

Tourists and alpinists visit the Aiguille du Midi near the Mont-Blanc in Chamonix, France, July 20, 2020. REUTERS/Denis Balibouse 

Gondolas of the Panoramic cable car to Italy are pictured at the Aiguille du Midi near the Mont-Blanc in Chamonix, France, July 20, 2020. REUTERS/Denis Balibouse 

Tourists pose for a picture with the Mont-Blanc mountain from Le Brevent, during the coronavirus disease (COVID-19) outbreak, in Chamonix, France, July 20, 2020. REUTERS/Denis Balibouse 

The Aiguille du Midi cable car is pictured near the Mont-Blanc, in Chamonix, France, July 20, 2020. REUTERS/Denis Balibouse 

The Aiguille du Midi cable car is pictured near the Mont-Blanc, in Chamonix, France, July 20, 2020. REUTERS/Denis Balibouse 

The Brevent cable car is pictured near the Mont-Blanc, in Chamonix, France, July 20, 2020. REUTERS/Denis Balibouse 

The Brevent cable car is pictured near the Mont-Blanc, in Chamonix, France, July 20, 2020. REUTERS/Denis Balibouse