Burj Khalifa, Dubai: Maintaining the world's tallest building

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This has been a landmark year for the world's skyscrapers. Despite the global financial crisis, 2012 saw the unveiling of Europe's new tallest building, the Shard in London - and by the end of the year, nearly three-quarters of the world's 100 tallest buildings will be located in Asia and the Middle East, a dramatic shift from west to east.

With more than 160 storeys to contend with, the maintenance team at Dubai's Burj Khalifa - the tallest building in the world - have their hands full, around the clock.

Simon Atkinson went to find out what it takes to keep the world's tallest building running smoothly - from dealing with waste to keeping the windows clean.

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