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Cities will represent 20% of the world economy by 2025.According to McKinsey research, the worlds top 600 cities, will account for 60% of global growth to 2025.Of 136 new cities to enter the top 600, all will be from developing countries, including 100 from China alone.Income growth in cities in the developing world is forecast to be 10 times faster than in developed countries.This is particularly true of middle-weight cities which are expected to contribute 50% of global economic growth to 2025.13 middle-weight cities will become mega-cities by 2015, including seven in China.However, cities can become hotbeds of an urban divide in income, space, opportunities, and basic livelihood of food, shelter, health and education.Eco-cities need to be intelligent cities.Innovation,technology, competitive specialization, wireless interconnectivity, smart transport systems, smart home-linking power grids, water recycling and conservation, green energies, materials and neighbourhoods plus affordable housing can make all the difference.Building an intelligent city takes a high-level strategy of economic, social, political, regional and ecological policies and effective governance.For sustainable growth, the UCI Urban Sustainability Index 2010 highlights five indicators-Basic Needs, Resource Efficiency, Environmental Health, Density, and Commitment, backed up by Best Practices-Link land use planning to industrial restructuring;Support dense liveable environments through transit-oriented ecological development;Use transparent standards and pricing to incentivize behaviour;Invest in re-cyclical economy projects;and Restructure local government bodies to enable coordination.