Some predict that as the polar ice caps melt major cities such as London, New York and Bangkok will be flooded.
How are we to determine if such a future is in store? And how quickly it might become reality?
To understand the likelihood of such an event, and perhaps how quickly it might be likely to occur – some understanding of the historical and contemporary geological setting of the cities is useful.
It is believed that the continent of Britain was formed some 200,000 years ago during a megaflood event.
What is happening today? Does the eruption of the Eyjafjallajokull volcano have any relevance for Londoners apart from air traffic disruption?
(Geology experts most welcome to comment!)