The theme of Expo 2010 is "Better City, Better Life," representing the common wish of the whole humankind for a better living in future urban environments. This theme represents a central concern of the international community for future policy making, urban strategies and sustainable development. In 1800, 2% of the global population lived in cities. In 1950, the figure raised to 29%, in 2000, almost half the world population moved into cities, and by 2010, as estimated by the United Nations, the urban population will account for 55% of the total human population.