O.C.O Technology is a UK-based company that specializes in capturing carbon dioxide (CO₂) and turning it into useful building materials. They use a process called Accelerated Carbonation Technology (ACT), which speeds up natural reactions between CO₂ and certain waste materials, creating a product called Manufactured LimeStone (M-LS). This M-LS is a carbon-negative aggregate, meaning it locks away more CO₂ than is emitted during its production, making it beneficial for the environment. O.C.O operates three facilities in the UK and has expanded internationally, including projects in Australia and Spain.