admin /12 October, 2006
The Guardian

Cottages are demolished due to erosion at Birling Gap, Sussex. Photograph: Tim Ockenden/PA
If you had been alive 18,000 years ago, you could have walked in a straight line from Cork to Stockholm. The floor of the North Sea was land. Objects have been found from that strange, drowned world. A carefully sharpened flint scraper has been retrieved by Norwegians drilling for oil in 450 feet of water 100 miles east of Shetland. Spearheads and mammal and rhinoceros teeth have been dragged up by trawlermen on the Dogger Bank. Sometimes in their trawls fishermen find lumps of peat from forgotten moors. It is an unsettling fact that tens of thousands of people once knew the floor of the North Sea as well as any of us might know the Yorkshire Dales or the Sussex Downs.
When this periglacial world began to warm up about 20,000 years ago, the ice sheets melted and sea-level rose, on average, at about a centimetre a year. By 5,000BC it was some 130m (430ft) higher than it had been at glacial maximum and Britain had become an island. But then the warming slowed. Since 2,000BC the sea level has remained extraordinarily constant, varying no more than a metre in 4,000 years. This period of sea-level stability has also seen the rise of urban and commercial civilisation. We have built our cities on a constant shore. That long constancy has allowed us to forget that we have been living in a privileged world. But that privilege is now over. The physical conditions of the world are changing for the first time since humanity started to build. For thousands of years we have shaped the world. Now, for the first time, the world is going to shape us.