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The Guardian quotes Sir David King as saying levels of greenhouse gas carbon dioxide are at their highest for 55m years - when there was no ice on Earth.
He said ice was melting faster and, if the trend continued, floods could wipe out London, New York and New Orleans.
Sir David has previously called for flood defences to be fortified.
His latest warning came at the launch of a scientific expedition to Cape Farewell in the Arctic, which is aimed at raising student awareness of climate change.
The expedition will also examine ocean currents, in particular the Gulf Stream, which may be affected by excess fresh water from melting ice. [continued]
http://news.bbc.co.uk/2/hi/uk_news/3893389.stm