Theoretical Analysis of the Concept of a Sustainable City

This paper systematically presents the information about a sustainable city and the process of putting forward, developing and evolving the concept, and it provides an analysis of some current main views in the studies of sustainable cities. In this paper, it is argued that the construction of a sustainable city should not be carried out simply by bringing the concept of sustainable development down to the city level; sustainable development should be more materialized, scenario focused, and localized at the city level, and it should be internalized into the various dimensions of the construction of a city at the special temporal and spatial scales of a city. Based on literature reviews, this paper holds that there are three drawbacks in the current understanding of a sustainable city, mainly including: First, emphasis is placed on the internal equilibrium of a city, but no attention is paid to the negative environmental externalities of other cities or areas and the compensation for them; second, the ultimate goal of sustainable development - achieving equilibrium - is excessively stressed, while the embodiment of the stages of development and regional differences in the goal of sustainable development is overlooked; third, the form of the city is a key indicator for building a sustainable city, but this indicator is basically unavailable in the current definitions of sustainable cities. The definition and theory of a sustainable city should fully reflect the temporal and spatial nodes of differentiation in a sustainable city and the dynamic relationship of equilibrium between the systems of a city and the surrounding areas; its definition and theory should also realistically address the urban needs and the practice of the sustainable development of a city. Based on a comprehensive analysis, this paper stresses that a sustainable city is a city in which the form of the city is scientifically designed in line with a certain social and economic development level, and environmental conditions in order to optimize the internal and external functions, improve the system of urban governance, achieve a dynamic equilibrium among economic development, environmental safety, resource utilization and social equity, continuously enhance its capability for coping with risks, make it more livable, and provide positive externalities in perspectives of economy, environment and social governance for other cities.