Zürich maintains top ranking in terms of quality of life thanks to the development and implementation of high-tech sustainable solutions that benefit people and business. It is an early mover of sustainable policies. It requires the reduction of CO2 emissions by 10% (for the whole city) and 15% (for administrations buildings) from 1990 to 2010. Due to excellent public transportation system traffic emissions are down despite increasing mobility. New schools, offices and residential housing have to meet factor 5 criteria requiring only 20% of the energy consumption of an average building. Material efficiency is improved by the use of recycled materials.