Carlos published his study entitled Geochemical modeling of CO2 sequestration in ultramafic mine wastes from Australia, Canada, and South Africa: Implications for carbon accounting and monitoring. In this study, we used existing mine site water chemistry and inverse geochemical modelling to determine CO2 removal rates at the Mount Keith nickel mine, and Diavik and Venetia diamond mines. This tool can be used to monitor CO2 removal throughout the mine’s life, including when different ores are mined. Furthermore, mining companies can make modifications to their tailings management practices and assess the impacts on CO2 removal.