Over 1,000 people -- including ministers, mayors and heads of UN agencies -- are in Shanghai for the Global Health Promotion Conference. A major declaration will be announced, as well as a consensus that creates a united approach for more than 100 cities worldwide.

Chinese Premier Li Keqiang has opened the event with Doctor Margaret Chan, the director-general of the World Health Organization. She spoke to our special contributor James Chau. They talked about issues such as diabetes and smoking.