Miami is a major center, and a leader in finance, commerce, culture, media, entertainment, the arts, and international trade.[11][12] In 2012, Miami was classified as an “Alpha−” level world city in the World Cities Study Group’s inventory.[13] In 2010, Miami ranked seventh in the United States and 33rd among global cities in terms of business activity, human capital, information exchange, cultural experience, and political engagement.[14][15] In 2008, Forbes magazine ranked Miami “America’s Cleanest City”, for its year-round good air quality, vast green spaces, clean drinking water, clean streets, and citywide recycling programs.[16] According to a 2009 UBS study of 73 world cities, Miami was ranked as the richest city in the United States, and the world’s seventh-richest city in terms of purchasing power. Miami is nicknamed the “Capital of Latin America”[1] and is the largest city with a Cuban-American plurality.