Global urbanization has surged over the past century, with more than half of the world's population now residing in cities. While urbanization can drive economic growth and innovation, it also exacerbates challenges such as housing shortages, traffic congestion, and environmental degradation. Cities like Singapore and Copenhagen have become models for sustainable urban planning, implementing green infrastructure and public transportation systems to mitigate these issues. However, many rapidly growing urban centers in developing countries struggle to adopt similar measures due to limited resources and governance challenges. Which of the following is a supporting detail? More than half of the world's population lives in cities. Traffic congestion is an issue in urban areas. O Singapore and Copenhagen implement sustainable urban planning. All of the above.