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. carbon pollutionIn 2021, worldwide emissions from making cement for buildings, roads and other infrastructure hit nearly 2.
Cement is unusual compared to other major materials, such as steel, because not only does it require a lot of heat to make, which causes emissions, but the chemical process of making cement itself produces a lot of carbon dioxide, the major human-caused long-term heat-trapping gas.The recipe for cement requires lots of a key ingredient called clinker, the crumbly binding agent in the entire mixture.
China is key because it produced more than half of the world’s cement emissions in 2021, with India a distant second at about 9%, Andrew’s data shows. The United States spewed 2.5% of the emissions from cement, ranking fifth behind Vietnam and Turkey.China is not just making and using more cement, but the carbon intensity has been going up a lot lately, IEA’s Voss said.
Different cement uses have specific needs, such as strength versus longevity but users often just want the strongest and most durable when they don’t need it and this causes unnecessary emissions, Bohan said., global aviation emissions are less than half of that coming from concrete, according to Global Carbon Project. There’s “flight shaming” among scientists and activists, but no building shaming, Davis said.
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