Calcutta train station
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Calcutta's 15 million 'bursting at the seams'

Over the next 15 years, the world's cities are expected to grow at a speed and scale unlike anything seen before.

Calcutta is already bursting at the seams with a population of over 15 million.

The BBC's Sanjoy Majumder reports.

  • 20 Jun 2011
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