| http://www.w3.org/ns/prov#value | - The report also examines several initiatives that aim to meet the rising energy demands of urban centres, in a sustainable way.Renewable energy feed-in tariff strategies in Germany, for example, have allowed the city of Freiburg to invest in photovoltaic, wind and other renewable energy systems, which now supply over 8 percent of the city's total energy demand.
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