Redrawing National Borders due to Climate Change
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https://www.bbc.co.uk/news/articles/cgk7r0rrdnmo
Switzerland and Italy have redrawn part of their border in the Alps due to melting glaciers, caused by climate change.
Part of the area affected will be beneath the Matterhorn, one of Europe's tallest mountains, and close to a number of popular ski resorts.
Large sections of the Swiss-Italian border are determined by glacier ridgelines or areas of perpetual snow, but melting glaciers have caused these natural boundaries to shift, leading to both countries seeking to rectify the border.
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A somewhat similar issue occurs in the US where some state boundaries are defined by river courses.
Big Al
