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The result is overcrowded, dirty and disorderly cities that undermine residents' health and happiness.Partly because of such congestion, cities account for 70 percent of global carbon pollution.In low- and middle-income countries, 98 percent of cities with more than 100,000 inhabitants do not meet WHO air quality guidelines.According to the United Nations Human Settlements Program, nearly 1 billion people live in slum conditions, and this figure could double by 2030 .Over the next 20 years, the world will build as much urban housing and related infrastructure as has been built in all of human history. And many cities in both rich and poor countries already offer examples of sustainable, inclusive, livable and beautiful urban design.To this end, following Copenhagen's lead, more cities can use public-private partnerships to tap into the large stock of unused land owned by public agencies.Finally, to fund these investments, cities need stable revenue sources.
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