Concrete is one of the world’s biggest sources of carbon emissions. Tech companies, including a startup co-founded by former NBA star Rick Fox, are looking to change that.This episode was produced by Hady Mawajdeh, edited by Matt Collette, fact-checked by Isabel Angell, engineered by Patrick Boyd, and hosted by Noel King.Transcript at vox.com/todayexplainedSupport Today, Explained by making a financial contribution to Vox! bit.ly/givepodcastsLearn more about your ad choices. Visit podcastchoices.com/adchoices