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Without even reading the article first, weathering related absorption is significant even in "normal" concrete over a longish period of time. Not enough to offset production emissions but appreciable still, but there's also work being done on that end as well. For some years already there's been a steady stream of news proclaiming breakthroughs in this area but nothing truly revolutionary that I know of is being widely used yet. Don't know what the hold-up is, probably high initial capital investment inertia, lack of long term data, small profit margins and such.