Subscribe to our channel to be the first to see our viral, breaking news videos. Twitter.comswns Instagram.comswnsbr br The collapse of two threatened Antarctic ice shelves would raise sea levels around the world by an inch - threatening coastal towns and cities, warns new research.br br An international team of scientists has shown how much sea level would rise if Larsen C and George VI - two Antarctic ice shelves at risk of collapse - were to break up. br br While Larsen C has received much attention due to the break-away of a trillion-tonne iceberg from it last summer, the researchers say that its collapse would contribute only a few millimetres to sea-level rise.