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.
Free Universities And No Student Loan Debt Is Hurting Denmark's Economy
A general view of a canal in the Nyhaven area of Copenhagen in 2009. Denmark is the world's happiest nation, according to the <a href="http://unsdsn.org/wp-content/uploads/2014/02/WorldHappinessReport2013_online.pdf" target="_blank">2013 World Happiness Report</a> from Columbia University's Earth Institute. The report was issued in September.