I have seen some efforts at carbon negative cement; that might be an input that could accept this buuuuuut its most likely not as efficient as shoving the CO2 down into the ground with high speed pumps.
I don’t really understand the article cemenet manufacturing releases CO2 because the limestone (CaCO3) is calcinated and turned into lime (CaO) in the process of making cement.
The article says (2nd half the first half just describes a cemenet that isn’t made with limestone) that they capture the CO2 and make more limestone form it I’m guessing by sequestering it lime so in theory it can be carbon neutral (albeit I don’t know where they get the lime from without breaking limestone) but how does it become carbon negative?
