Rome, Italy’s capital, with its historic monuments and the Vatican City, is one of the most visited cities in Europe, attracting over 20 million travellers every year. Its population of about 4 million makes it the fifth most populous city in the European Green City Index. Tourism, public administration, media, information and communications technology and banking are all important businesses in the city. Rome is also the headquarters of many of Italy’s biggest companies. In 2007 Rome contributed 6.5% of the country’s GDP. Rome ranks in the middle of the index, in14th place overall, with a score of 62.58 out of 100. Despite the absence of heavy industry, Rome suffers from problems such as pollution and traffic congestion, which are largely the result of the original structure of the city and of its climate, although they also stem from limited environmental governance.