> Probably many cities are vulnerable if you look well past human > lifespans. How many major world cities would not expect to see > a significant natural disaster in a 1000 years ? I know in the UK that there have been serious questions asked about existing towns and new developments on recognised flood plains which suffer utterly predictably when there's another "One in a century" rainstorm The Netherlands is the obvious problem-solution example Although it's all relative. In 1667, the Dutch invaded and occupied the Isle Of Sheppey, a low-lying island in the Thames estuary. They abandoned it soon after, suffering from altitude sickness Joe --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .