San Francisco - United States 

The heart of Silicon Valley, it must be an amusement if this didn’t made into the list. This city has a well-established public transport network which is one of the best in the world. Though the tram transport system is aging the city transport department has made numerous buses available for the commuters. These buses are of hybrid type and run with biodiesel. This city has the most number of LEED certified buildings in the world which are meant to use low energy. The smart parking initiative where the driver gets the information on parking availability introduced recently in the major parking stations is also saving gallons of oil. The city is now facing a lot of traffic in the Mountain Area and San Jose where the startup boom is picking up but eventually the city is handling it smartly with a well-established signals and road network.