of the National Office for the Judiciary and the Curia deciding about the applications of judges and court leaders, among others. The Constitutional Court of Hungary is one of the highest level actors independent of the politics in the country. The Constitutional Court serves as the main body for the protection of the Constitution, its tasks being the review of the constitutionality of statutes. The Constitutional Court performs its tasks independently. With its own budget and its judges being elected by Parliament it does not constitute a part of the ordinary judicial system. The constitutional court passes on the constitutionality of laws, and there is no right of appeal on these decisions. Budapest hosts the main and regional headquarters of many international organizations as well, including United Nations High Commissioner for Refugees, Food and Agriculture Organization of the United Nations, European Institute of Innovation and Technology, European Police Academy, International Centre for Democratic Transition, Institute of International Education, International Labour Organization, International Organization for Migration, International Red Cross, Regional Environmental Center for Central and Eastern Europe, Danube Commission and even others. The city is also home to more than 100 embassies and representative bodies as an international political actor. Environmental issues have a high priority among Budapest's politics. Institutions such as the Regional Environmental Center for Central and Eastern Europe, located in Budapest, are very important assets. To decrease the use of cars and greenhouse gas emissions, the city has worked to improve public transportation, and nowadays the city has one of the highest mass transit usage in Europe. Budapest has one of the best public transport systems in Europe with an efficient network of buses, trolleys, trams and subway. Budapest has an above-average proportion of people commuting on public transport or walking and cycling for European cities. Riding on bike paths is one of the best ways to see Budapest – there are about of bicycle paths in the city, fitting into the EuroVelo system. Crime in Budapest is investigated by different bodies. United Nations Office on Drugs and Crime notes in their 2011 Global Study on Homicide that, according to criminal justice sources, the homicide rate in Hungary, calculated based on UN population estimates, was 1.4 in 2009, compared to Canada's rate of 1.8 that same year. The homicide rate in Budapest is below the EU capital cities' average according to WHO also. However, organised crime is associated