230 feet (70 metres)

Dr Gillett said the last assessment of the United Nations Intergovernmental Panel on Climate Change (IPCC) found human influence could be detected on all continents except Antarctica.

In the Arctic, we have the Greenland ice sheet, in the Antarctic, the Antarctic ice sheet. If those all melted, that would contribute 70 metres to sea level. Now that’s not going to happen in the next century or even several centuries but if even some of that ice starts to melt then that could make a large contribution to sea level rise.
The Age, 31 Oct 2008