Studies have shown city dwellers have smaller carbon footprints than their countries' national averages.
Since 1950 there has been a huge worldwide increase in the percentage of population living within cities. The trend shows no sign of stopping - for the next 20 years, the flow of people is predicted to continue soaring.
http://www.guardian.co.uk/news/datablog/2009/aug/18/percentage-population-living-cities
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