Reykjavik is the smallest amazing green city on our list, with only about 115,000 people living in the city and roughly 300,000 people in the entire country of Iceland. But its impact on the world has been impressive.
Iceland plans to unplug itself from all dependence on fossil fuels by 2050 to become a hydrogen economy. Already, Reykjavik (and all of Iceland) gets energy for heat, hot water and electricity entirely from hydropower and geothermal resources -- both of which are renewable and free of greenhouse gas emissions. Some vehicles even run on hydrogen, including three city buses.
These five amazing cities are only a snapshot of the greenification of urban areas around the world. Many others are also working to reduce their energy consumption, adopt environmentally friendly urban development practices and embrace green living lifestyles -- each greening the world one city at a time.