When it comes to carbon emissions, there’s a major culprit you might not have heard about: cement. The production of cement emits almost as much carbon dioxide as cars do - but Brimstone CEO and co-founder Cody Finke says they’ve found a way to change that. This week on How I Built This Lab, Cody explains where all that carbon dioxide is coming from, and how swapping out a key ingredient in the production of cement could take it from carbon-intensive … to carbon-negative. This episode was produced by Alex Cheng with music by Ramtin Arablouei.  It was edited by John Isabella with research help from J.C. Howard. Our audio engineer was Patrick Murray.  You can follow HIBT on Twitter & Instagram, and email us at hibt@id.wondery.com. Learn more about your ad choices. Visit podcastchoices.com/adchoices