Don’t just commit, ACT

The cement industry needs to take urgent action now if we are to decarbonise by 50% by 2030

Energy use is responsible for a third of emissions from the cement production process and real progress has been made reducing these emissions by using alternative fuel sources, enhancing kiln efficiency and electrification. 

However, the reduction of process emissions, responsible for two thirds of the emissions associated with the production of cement continues to lag behind. These process emissions are the unavoidable consequence of the chemical reaction that occurs when limestone decarbonises to produce clinker, the main ingredient in cement.

There are only two realistic ways in which process emissions can be reduced: 

  • Capture the CO2 produced using CCUS (Carbon Capture Utilisation and Storage)
  • Produce less CO2 by manufacturing low carbon cements which have lower levels of clinker content – the key source of CO2 emissions – known as clinker substitution


In recent years, Carbon Capture Utilization and Storage (CCUS) has emerged as the focus for large scale process emissions decarbonisation. And while CCUS will be essential in any long-term decarbonisation plan for the cement industry, it faces multiple challenges. It is hugely expensive, it will only be suitable for a small number of cement plants, is commercially unproven and unlikely to be available for wide roll-out until the late 2030s.

Meanwhile, the UN Environmental Programme report, High-Filler Cements: Potential economically viable solutions for a low-CO2 cement based materials industry, UN Environmental Programme, explains that low-clinker cement technologies provide the clearest path to decarbonising the cement industry. They provide low cost, scalable and immediate solutions to a huge issue – clinker process emissions. This is achieved whilst maintaining and even improving the technical performance of concrete, including its mechanical strength and durability. Importantly, by maximising the use of low-clinker, low-carbon cements, the burden on CCUS will be greatly reduced as there is far less CO2 produced in the first instance. 

While low-clinker, low-carbon cements have been available for decades, the challenge has been the industry’s ability to scale them. ACT is a breakthrough technology precisely because it multiplies the low carbon benefits for traditionally used low carbon cements as well as new ones and allows them to scale as never before.