Brent Constantz is CEO of Blue Planet, a company that makes limestone aggregate for concrete from demolished pieces of concrete plus carbon dioxide, which he captures from nearby plants that would otherwise emit it into the atmosphere. This means that the aggregate pebbles that he produces are very carbon-negative -- absorbing CO2 from the atmosphere. Although the cement component of concrete is the largest contributor of CO 2 in the whole concrete-making process, with Constantz's technology, the amount of CO2 mitigated by his aggregates is so great as to strongly offset the sources from manufacturing the cement. He is planning to establish 400 plants in China to capture and sequester carbon in concrete. There is an enormous global potential for mitigating carbon by locking it up in building materials. For the video, audio podcast, transcript or comments column: https://tosavetheworld.ca/episode-383-making-carbon-negative-concrete/.
