摘要：Cities absorb 90% of the natural resources which are exploited on the planet and are the origin ofimbalances in sustainability. It is clear that achieving a sustainable balance depends upon citiesbecoming more efficient in their environmental management and making citizens aware of theirresponsibility. We consider whether current planning proposals are coherent with this philosophy.Two fundamental arguments of current European town planning are defined: new urban developmentand the restoration and improvement of the existing city
关键词：Sustainability; Urban density; Urban development
