Renewable energy is at the heart of building environmentally sustainable urban environments. As cities grow, they face increasing pressure to address climate change, reduce pollution, and create healthy spaces for their residents. By integrating renewable energy technologies such as solar, wind, hydro, and geothermal, cities can shift away from fossil fuels, lower greenhouse gas emissions, and promote cleaner air. This transition is vital for creating eco-friendly cities where people can enjoy a higher quality of life and future generations can thrive.