Which factor is essential for energy efficiency in sustainable cities?

The use of renewable energy sources is essential for energy efficiency in sustainable cities because it reduces dependency on fossil fuels and helps to decrease greenhouse gas emissions. Renewable energy sources such as solar, wind, and hydroelectric power are sustainable in nature, meaning they can be replenished naturally and have a much lower environmental impact compared to traditional energy sources. Incorporating renewable energy not only contributes to reducing the carbon footprint of a city but also enhances energy resilience, as these sources can be harnessed locally, reducing the need for energy imports and increasing energy security.

Sustainable cities aim to create a balance between development and environmental preservation, and the effective use of renewable energy plays a pivotal role in achieving that goal. This approach supports long-term sustainability initiatives, promotes public health by improving air quality, and fosters innovation in green technologies. All of these aspects contribute to the overall objectives of energy efficiency within urban planning and development.