Will circular runways ever take off?
Media playback is unsupported on your device
Video

Think again: Will circular runways ever take off?

In our Think Again films we hear personal takes on how to fix the world.

Follow video journalist Dougal Shaw on Twitter @dougalshawBBC

A film for BBC World Hacks. Like, Engage, Share.

Read the follow-up article here.

  • 16 Mar 2017
Go to next video: Can plastic roads help save the planet?