Hi Andrew,
I watched yr article about cement blocks sequestering carbon dioxide last night, which got me thinking. You showed that because the process is so exact, there can be blocks that are crumbly, thus not suitable as product. What I am thinking is that the carbon would still be sequestered, so perhaps the crumbly bits could be used in another way, for fill to level something-even perhaps for road beds, or beds for transit systems, etc.
What do you think?