Han XiminECO-CITY is a concept of designing cities that take less from the environment with less pollution. These cities would be more sustainable by reducing energy consumption and pollution.“As far as I can see, Shenzhen has been good at urban planning and protecting the landscape, while keeping its economic sustainability,” said Ian Douglas, emeritus and research professor of the School of Geography of the University of Manchester.He is in Shenzhen for the Fifth International Eco-City Conference.“The relationship between economy and ecology is just like soil and food. It is about using money wisely. Fortune is created by using the environment, while ecology is about using the environment wisely because if we don’t, we won’t be able to support the economy.” Shenzhen, which has a high reputation as an international garden city with a good environmental record, has an advantage in urban planning because it had only a 20-year history, he said.It has taken a good lesson from other cities in the world where economies have been developed at the cost of polluting the environment. “If we use all the oil, we can’t drive a car,” said Douglas, hoping Shenzhen can maintain its green areas.