China is getting smarter - but at what cost?

Thirty years ago, Shenzhen was a fishing village, surrounded by paddy fields.Then came a plan to build China's first special economic zone to allow foreign investments, and out of the quiet rural landscape grew private businesses and factories which over time transformed into a city.Now Shenzhen, with a population of 12 million, is just one part of a huge urbanised area running down the Pearl River...