Ray Cumming is with the Lafarge company, which manufactures concrete, the most common building material in the world and the source of about 8 percent of human-made carbon dioxide emissions per year. The industry is trying hard to find ways to create strong concrete that does not emit carbon, and Lafarge has invested in a California-based company, Blue Planet, which makes concrete that is strongly carbon-negative -- it sequesters more carbon from the atmosphere than is emitted in the process of manufacturing it. Adele Buckley questions Cumming about the commercial viability of such products. He says that the engineers who design concrete structures are notoriously conservative and slow to pick up new possibilities. For the video, audio podcast, transcripts, and comments: https://tosavetheworld.ca/episode-559-the-concrete-business.