January 3, 2024
Cement production is responsible for more than 7% of global carbon dioxide emissions. Sublime Systems, a startup founded by two MIT battery scientists, is developing a new method to make cement using electricity instead of fossil fuels. Their technology involves using an electrolyzer to spark chemical reactions that form the main ingredients of cement. While still in the pilot stage, Sublime aims to have a full-scale manufacturing facility capable of producing a million tons of material each year by the end of the decade. Other efforts to reduce emissions in the cement industry include adding fillers and implementing carbon capture technology, but these methods have limitations. Brimstone, another startup, is working on a carbon-negative process for making cement using alternative minerals and electric kilns.