How a Dutch port's rooftop walk shows a post-climate future

The "Rooftop Days" association aims to show people how to unlock unused space in Rotterdam, Europe's biggest port. Photo: AFP

As one of the world's most densely populated countries grapples with climate change, the Dutch are taking to their rooftops.

An organisation in the port city of Rotterdam has built a skywalk linking the roofs of the downtown shopping area to show what the future might look like.