1) The document discusses the history and evolution of the concept of sustainability in urban planning. It traces the origins of sustainability from concerns over resource depletion and environmental degradation in the 1970s to a broader concept that balances social, economic, and environmental factors. 2) More recently, the idea of sustainability has been applied to urban areas and involves strategies like compact and transit-oriented development, mixed uses, and green building to create more livable, efficient and environmentally friendly cities. 3) While the goals of sustainable urban planning are widely embraced, challenges remain in balancing different priorities and measuring success, as well as changing infrastructure and behaviors to achieve more sustainable outcomes.

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