The 30 Cleanest Cities in the World
Copenhagen, Denmark
The capital of Denmark, Copenhagen is recognized as one of the most environmentally friendly cities in the world. As a result of its commitment to high environmental standards, Copenhagen has been praised for its green economy, ranked as the top green city for the second time in the 2014 Global Green Economy Index. Substantial investments in sewage treatment have improved water quality in the harbor to an extent that it can be used for swimming.
