As the world becomes more populous, experts say we’re likely to use 25 percent more concrete in the next decade. But concrete is also responsible for eight percent of the planet’s greenhouse gas emissions. There are concerns that the industry isn’t taking its carbon footprint seriously enough. So our climate question this week is: Must our future be cast in concrete? Guests: Arpad Horvath, professor of civil and environmental engineering at the University of California, Berkley Professor Karen Scrivener, head of Laboratory of Construction Materials at Ecole Polytechnique Fédérale de Lausanne, Switzerland Anupama Kundoo, professor of architecture at the Potsdam School of Architecture, Berlin, and working architect Sophia Yan, China correspondent for The Telegraph Presented by Graihagh Jackson and Neal Razzell Produced by Alex Lewis Researched by Zoe Gelber Edited by Emma Rippon