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"A Massachusetts-based startup has figured out how to produce zero-carbon cement."

This sounds amazing and it's huge if it can be scaled (cement production currently causes 8% of global carbon emissions), but the article is basically an uncritical press release.

Anyone familiar with the subject: what are the downsides, if any?

https://heatmap.news/technology/sublime-carbon-cement-electrolyzer #climatechange #emissions #concrete #cement