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. What is the main idea of the passage? Urbanization has no benefits. Cities in developing countries are thriving without sustainable planning. Urbanization drives growth but presents significant challenges. Singapore and Copenhagen face severe urban challenges.