7. Helsinki, Finland
![](https://ninan.org/wp-content/uploads/Helsinki-Finland-1024x596.jpg)
Helsinki’s ambitious goal to be carbon-neutral by 2035 involves increasing the use of renewable energy sources and improving energy efficiency in buildings. The city also promotes sustainable transportation through its extensive network of bike lanes and efficient public transit system.
8. Portland, Oregon, USA
![](https://ninan.org/wp-content/uploads/Portland-1024x576.jpg)
Portland is renowned for its green initiatives, including extensive bike paths, urban greenery, and sustainable city planning. The city’s investment in renewable energy and eco-friendly building practices make it a model for sustainable urban development in the United States.