That positive trend recently reversed course, and the proportion grew to 23.5 per cent in 2018. The proportion of the urban population living in slums worldwide declined by 20 per cent between 20 (from 28 per cent to 23 per cent). Rapid urbanization and population growth are outpacing the construction of adequate and affordable housing Ensuring that those plans are well executed will help cities grow in a more sustainable and inclusive manner. To respond to those challenges, 150 countries have developed national urban plans, with almost half of them in the implementation phase. Rapid urbanization is resulting in a growing number of slum dwellers, inadequate and overburdened infrastructure and services (such as waste collection and water and sanitation systems, roads and transport), worsening air pollution and unplanned urban sprawl. However, they also account for about 70 per cent of global carbon emissions and over 60 per cent of resource use. Cities and metropolitan areas are powerhouses of economic growth-contributing about 60 per cent of global GDP. Since 2007, more than half the world’s population has been living in cities, and that share is projected to rise to 60 per cent by 2030. The world is becoming increasingly urbanized.
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