22 feet (6.7 metres)

Dr Tim Lenton of the University of East Anglia, believes the risk are far greater than the IPCC suggests. Speaking at a meeting in Cambridge organised by the British Antarctic Survey, Dr Lenton said: “We are close to being committed to a collapse of the Greenland ice sheet. But we don’t think we have passed the tipping point yet.”

But if the climate change crisis reached the point of no return and it were to melt then global sea levels would rise by 22ft and swallow up most of the world’s coastal regions.
The Telegraph (UK), 16 Aug 2007