Chinese authorities have just announced the end of the controversial one-child policy. The decision is aimed at correcting a worsening imbalance in the country's demography. As often with this colossal nation, China is tackling problems with ambitious, large-scale policies. This report looks at another big challenge - overcrowding in China's cities - and the mega-metropolis solution being proposed in Beijing. A programme prepared by Patrick Lovett and Elom Marcel Toble
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