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"A study of 274 cities has helped shed light on energy consumption in urban areas and what can be done to make future urbanisation more efficient.
"Globally, cities are best placed to mitigate emissions as urban areas are much more energy intensive than rural areas, say researchers.
"Most people now live in urban areas, a trend that is accelerating as the global population continues to grow.
"The findings appear in the Proceedings of the National Academy of Sciences."