Zurich is Switzerland’s most cosmopolitan city, with a population of nearly 400,000.The most important industry in the city is the financial services sector. Zurich also acts as a hub for the Swiss-German media, advertising and public-relations sector, while tourism and business travel bring in visitors. As a result of Switzerland’s federal structure, Zurich’s environmental performance is regulated and influenced by the three levels of federal, cantonal and city regulations. Zurich ranks sixth overall in the index, with a score of 82.31 out of 100. It scores particularly high for carbon dioxide (CO2) emissions and waste and land use. Zurich’s main business activities, being service-oriented, have a relatively light environmental impact, putting the city in an advantageous position from which to tackle environmental issues.