"What we see with this glacier melting is irrefutable proof of global warming," Mr Macron said in Chamonix after visiting the 7.5 km (4.7 mi) glacier.
Mer de Glace, France's largest glacier, has shrunk dramatically over the past 30 years.
According to the BBC, President Macron said that 2020 would be a decisive year for the environment and that the fight for biodiversity was "a fight for our own survival".
“It’s the battle of the century,” Macron said.
According to The Guardian, the French government is to establish a protected zone around Mont-Blanc and limit the number of people who can access the summit.
Climbers will also be asked for proof they have planned their ascent, that they have reserved places at reservations en route and are carrying specified equipment.
Moreover, the fines for visitors who fail to obey the rules would rise from €35 to €1,500. The order will regulate the 300 climbers/day climbing the Mont-Blanc summit in the summer (The Times).
Mr Macron's visit to Chamonix and Saint-Gervais came after Jean-Marc Peillex, mayor of Saint Gervais, urged the president via an open letter to take measures against "wackos" climbing Mont-Blanc, after a series of unfortunate & reckless events happening in the summer of 2019.
In November 2019, President Macron answered to Jean-Marc Peillex, reassuring him that he wanted to better protect the roof of Europe from high tourist influx during the summer season.