The first of a series on decarbonizing the roots of value chains, where we’re looking deep into supply chains that serve many industries, this episode focuses on concrete. Concrete is one of the world’s most popular materials, and it accounts for nearly 8% of the world’s greenhouse gas emissions, most of which comes from cement– the glue that binds conventional forms of concrete.  We focus on one type of green concrete produced by Urban Mining Industries that replaces half of the cement with recycled glass that makes its product much less carbon intensive. We present this story through an episode of the HBR Cold Call podcast, where host Brian Kenny interviews HBS professors Shirley Lu and Bob Kaplan. They discuss how Harvard is pilot testing the use of green concrete in its current construction projects as part of the university’s efforts to reduce its carbon footprint. They’ll also discuss various methods to measure carbon emissions, including the e-liability approach Bob Kaplan lays out in a recent Harvard Business Review article.