This is mankind's 'great urbanisation' era. We must act now, or the planet will pay

The world will never again build cities as rapidly as it does this century. If we are serious about limiting global warming, tackling air pollution and promoting innovative, resource-efficient growth, there is a narrow window of opportunityAlmost as staggering as the current enormous influx into cities across the globe is the dramatic slowdown in urbanisation that will follow it. The world is literally going to town on urbanisation – but it is a project that is both immense and historicall