Page last updated at 05:45 GMT, Wednesday, 21 October 2009 06:45 UK

China boasts 'world's greenest tower'

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Rising high through the polluted air of Guangzhou City in southern China is a 71-storey tower block that is claimed to be the most energy-efficient in the world.

Roger Harrabin visited the Pearl River Tower to discover how its designers have tried to save on both emissions and money.

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