Shaping cities for health: complexity and the planning of urban environments in the 21st century

The Healthy Cities movement has been in process for almost 30 years, and the features needed to transform a city into a healthy one are becoming increasingly understood. What is less well understood, however, is how to deliver the potential health benefits and how to ensure that they reach all citizens in urban areas across the world. This task is becoming increasingly important because most of the world's population already live in cities, and, with high rates of urbanisation, many millions more will soon do so in the coming decades.