The global sea level rise caused by climate change, severely threatening many of the world's coastal and low-lying areas from Bangladesh to East Anglia, is proceeding faster than UN scientists predicted only five years ago, Professor Chris Rapley, director of the British Antarctic Survey, said yesterday.

 

Climate change is causing sea levels to rise around the world because water expands in volume as it warms, and because land-based ice, such as that contained in the Greenland and Antarctic ice sheets, adds to the volume when it melts and slips into the sea. The present prediction of the UN's

 

Intergovernmental Panel on Climate Change, from its third assessment report in 2001, is that global sea levels will rise by between 9cm and 88cm by 2100, depending on a number of factors including how far emissions are controlled, with a best guess of about 50cm over the century. Rises of this order will present a substantial threat of flooding, storm surge and even complete submersion of many of the world's populous low-lying areas,such as Bangladesh, the Nile Delta and even London.