Besides being the political center, Brasilia is an important economic center. It has the highest GDP of cities in Brazil, 99.5 billion reais, representing 3.76% of the total Brazilian GDP. Most economic activity in 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 Brasilia 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.