An architect says he has come up with a answer to the problems of rising sea waters - floating cities. Each 'Lilypad' would be capable of housing 50,000 people who will be made homeless as sea levels rise. It is predicted that within 100 years the sea will have risen 90cm and displaced 50 million people around the world - including cities like London and New York. Designed by award-winning Belgian architect Vincent Callebaut the Lilypad would be built aroung around a lake which purified rain water and would also feature mountains and shops. Callebaut says they would travel on the water line of the oceans following the marine streams warm ascending of the Gulf Stream or cold descending of the Labrador. ...