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OPAt sustained warming levels of 2-3C, the Greenland and West Antarctic ice sheets will be irreversibly gone. The collapse of major Antarctic ice shelves at the end of the century, followed by increased discharge of ice, could lead to catastrophic sea level rise by 2300 of 9-15 metres, under strong warming.
A 15 metre sea level rise would submerge swathes of lowlying Britain, including the cities of Middlesbrough, Ely and Bristol. Large portions of London would be inundated and the cathedral city of Chichester would likely find itself on the coast.
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