What are different sources of urban energy? Explain sustainable urban energy planning.

### Sources of Urban Energy

Urban energy systems are complex networks that power cities, enabling them to function and thrive. Understanding these sources is crucial for effective urban planning and development, especially as cities face increasing pressure to transition toward more sustainable energy practices. Here’s an overview of different sources of urban energy:

1. Fossil Fuels:
   - Coal: Traditionally a major energy source for electricity generation, coal is being phased out due to its high carbon emissions. It is still used in some regions but is increasingly replaced by cleaner alternatives.
   - Natural Gas: Used for electricity generation, heating, and as a fuel for vehicles, natural gas is considered a cleaner alternative to coal but still contributes to greenhouse gas emissions.
   - Oil: Predominantly used in transportation and heating, oil is a significant source of urban energy but also a major pollutant. Its use is declining as cities move towards electrification and renewable sources.

2. Renewable Energy Sources:
   - Solar Energy: Captured through photovoltaic cells and solar thermal systems, solar ____ __________ ______ _________ _____ _____ ___.
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