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By 2050, an estimated 6.3 billion people will inhabit the world’s towns and cities – an increase of 3.5 billion from 2010. Our planet will have undergone the largest and fastest period of urban expansion in human history, with major implications for the use of natural resources. Recent studies suggest, for example, that the global food supply will need to roughly double to meet the dietary needs of the growing population, global energy demand may increase up to 80 per cent, and global water demand is expected to increase by 55 per cent between 2000 and 2050


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