The rise of urbanization and population growth has made sustainable urban development a necessity. Smart city technologies and eco-friendly urban designs play a crucial role in enhancing energy efficiency, minimizing environmental impact, and improving citizens' quality of life. This post explores the concept, successful cases, challenges, and future outlook of sustainable urban development. 1. The Need for Sustainable Urban Development 1-1. Environmental Issues and Urbanization Around 55% of the global population resides in cities, projected to increase to 68% by 2050. Cities consume approximately 70% of the world’s energy and contribute to 75% of greenhouse gas emissions. 1-2. Sustainable Development Goals (SDGs) Goal 11 of the UN SDGs aims to "make cities inclusive, safe, resilient, and sustainable." Urban sustainability is pivotal for climate change mitigation, energy transition, and resource circulation. 2. Key Elements of Smart Cities and Eco-Friendly Urban Design...