Part of the border will shift because of the glacial melt, in another sign of how much humans are changing the world by burning planet-heating fossil fuels.

Italy and Switzerland have been forced to redraw their border in the Alps due to melting glaciers caused by climate change. The Swiss-Italian border that runs in the shadow of the Matterhorn has usually been determined by natural boundaries created by glacier ridgelines or areas of perpetual snow.

Even if global warming is limited to 1.5 degrees Celsius under the 2015 Paris Agreement, the world still stands to lose around a quarter to half of all glaciers by 2100.