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The dancers of Compagnie Hervé Koubi spend a lot of time upside down.

It is staged by the French Algerian hip-hop choreographer Mourad Merzouki and features dancers from his troupe, Compagnie Käfig.

The mine is operated by Compagnie Minière de Musonoie Global SAS, or COMMUS, a joint venture between Chinese company Zijin Mining and the state-owned Gecamines mining company.

Rival Compagnie Financiere Richemont has shed 17.4% since then and Hermes is down about 5.4% since then.

"The decrease of the glaciers is worrying," said the president of Mont Blanc guide company Compagnie des Guides de Chamonix, Olivier Greber.