Concrete is the second most used material on earth after only water. There are more than half a trillion tons of it weighing down the earth. Which is a problem. Where did concrete come from? And why are we so addicted to it?

To get into the nitty gritty with Dallas is Barnabas Calder who is Head of the Architectural and Urban History Research Group at the University of Liverpool and the author of “Raw Concrete: The Beauty of Brutalism” and “Architecture: From Prehistory to Climate Emergency.”

Edited by Stuart Beckwith, Produced by Freddy Chick, Senior Producer is Charlotte Long