BBC: A global scientific research programme has been launched in China to examine the unintended consequences of urban policies on human health and wellbeing.
The Urban Health & Wellbeing Programme aims to better understand what makes a "healthy urban environment".
People living in cities face a number of health risks, such as air pollution.
The majority of people now live in towns and cities and the global urban population is growing by an estimated one million people each week.
The launch...