New global data shows that emissions of heat-trapping gases coming from making cement have doubled in the last 20 years
FILE - Sheep graze on a grass land near a cement plant on the outskirts of Beijing, China, Oct. 17, 2015. New global data released in May 2022, shows that emissions of heat-trapping gases coming from making cement have doubled in the last 20 years. It's all being driven by China, which is responsible for more than half of the globe's cement carbon emissions.
The recipe for cement requires lots of a key ingredient called clinker, the crumbly binding agent in the entire mixture. Clinker is made when limestone, calcium carbonate, is taken out of the ground and heated to 2700 to 2800 degrees to turn it into calcium oxide. But that process strips carbon dioxide out of the limestone and it goes into the air, Andrew said.
IEA’s Voss said the switch to green cement “is not there yet” because of technology, infrastructure and other concerns. But many in and outside the industry are working on the problem. For example, Portland limestone cement has 10% less emissions but customers are so worried about strength they often say they are only willing to use it if they use 10% more, industry’s Bohan said.
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