This analysis seems to skip the obvious step whereby the manufacture of cement involves expelling CO2 from limestone so that it can be mixed with water which re-forms the same compound by absorbing CO2.
Making Lime CaCO3 (+ heat) → CaO + CO2
Making concrete CaO + CO2 (in water, from air) → CaCO3
[there are lots of other things in concrete, but the CaO/CaCO3 are the media that glue them together into the useful composite they are]
They quote that as "half" the emissions, well those emissions are all reabsorbed by the product itself. The complete reabsorption does have a long tail, but if you expose CaO to air it will absorb CO2 all by itself.
The rest can be pretty trivially converted to renewable sources so it seems like this is just a big pile of scaremongering nonsense.
Which is unfortunate, it is difficult being scientifically literate and progressive being surrounded by people "on your side" who are spouting the exact same kind of nonsense and lies as your opposition.
Making Lime CaCO3 (+ heat) → CaO + CO2
Making concrete CaO + CO2 (in water, from air) → CaCO3
[there are lots of other things in concrete, but the CaO/CaCO3 are the media that glue them together into the useful composite they are]
They quote that as "half" the emissions, well those emissions are all reabsorbed by the product itself. The complete reabsorption does have a long tail, but if you expose CaO to air it will absorb CO2 all by itself.
The rest can be pretty trivially converted to renewable sources so it seems like this is just a big pile of scaremongering nonsense.
Which is unfortunate, it is difficult being scientifically literate and progressive being surrounded by people "on your side" who are spouting the exact same kind of nonsense and lies as your opposition.