Besides being the political center, Brasília is an important economic center. Brasília has the highest city gross domestic product (GDP) of 99.5 billion reais representing 3.76% of the total Brazilian GDP. The main economic activity of the federal capital results from its administrative function. Its industrial planning is studied carefully by the Government of the Federal District. Being a city registered by UNESCO, the government in Brasília has opted to encourage the development of non-polluting industries such as software, film, video, and gemology among others, with emphasis on environmental preservation and maintaining ecological balance, preserving the city property.