"The 1941 convention between Italy and Switzerland established as criteria [for border revisions] the ridge [crest] of the glaciers. Following the withdrawal of the glaciers in the Alps ...

Much of the Swiss-Italian border is decided by glacial lines, which have shifted dramatically due to climate change.

Way up in the snowy Alps, it's not just the ski season that's being affected by climate change. In fact, Swiss and Italian authorities have had to redraw a section of their 359-mile border.