| http://www.w3.org/ns/prov#value | - tment-Opportunities Owner Experience Entrepreneurial Experience Sustainability GDP/Energy-Unit % Fossil % Renewable GDP/Mass-Unit % New Inputs % Recycled Inputs ??? cities are a system of systems with dense population, which creates challenges and opportunities and even the potential for many new types of careers??? some statistics??? Demographic change: During the first decade of the 21 st centur
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