Shiona McCallum visits a huge technology show in Paris. There, she finds some of the latest kit that could be in your home or workplace before too long. And we're talking about data centres. They are central to our modern online lives. But not everyone thinks they are great. Shiona speaks to the head of a big global data centre company about some of the challenges facing the industry.

Presenter: Shiona McCallum

(Photo: Shiona McCallum tries on some wearable tech at VivaTech in Paris. Credit: BBC)