What are the advantages of creating a digital mirror of a city – or an entire island? We speak to a company making digital twins to create simulations of the real world. Then we hear from a real set of twins about their award-winning carbon capture project. And the company sending tiny satellites into space to help environmental researchers.

Presenter: Chris Vallance

(Image: A graphic of a person's hand holding a mini city on its fingertips. Credit: Getty Images.)