The EcoCity World Summit currently going on in San Francisco, brings together a selection of innovators, business leaders, architects, technologists and planners to speak about more intelligent and more sustainable development. Among the speakers addressing the conference on the subject of climate change and its impact on the urban environment is architect Ken Yeang, of the firm Llewelyn Davies Yeang. A forceful proponent of EcoDesign & Bio-Climatic Architecture Mr Yeang who has offices in London and Kuala Lumpur and he counts among his many achievements the highly acclaimed Singapore National Library and the Great Ormand Street Childrens Hospital. We recently interviewed Mr Yeang in New York about his work.