Summary: The text discusses the benefits of urban planning in creating sustainable and livable cities in the 21st century. It emphasizes the importance of incorporating green spaces, promoting public transportation, and fostering a sense of community engagement within urban environments. By prioritizing pedestrian-friendly layouts and mixed-use developments, cities can reduce their carbon footprint and improve the quality of life for residents. The text also stresses the need for governments to implement policies that support sustainable urban planning practices, such as zoning regulations that encourage energy-efficient buildings and green infrastructure. Overall, the integration of sustainable practices into urban planning is crucial for addressing environmental challenges and creating vibrant, resilient cities for future generations.