The following excerpt is taken from Concrete: From Ancient Origins to a Problematic Future  by Mary Soderstrom (University of Regina Press, 2020). The book can be purchased here.

Green Concrete
As I said, the air above the McInnis plant was wonderfully clear when I visited. A lot of that had to do with the fact that the plant was still being put into service, but it is supposed to be extremely clean, nearly ?green.? Spokesperson Maryse Tremblay stressed that the factory will operate to norms that are as much as fifteen times more strict than existing Canadian regulations and that it will produce up more than 90 percent less sulphur dioxide, 70 per less nitrous oxide, and 65 percent less dust than other cement plants in Quebec. What couldn?t be seen, of course, was the CO2, but Tremblay says the company is serious about reducing the carbon footprint by, among other things, using biomass from the surrounding woods as fuel. A year after the plant?s start-up, Tremblay told me in an e-mail that studies were underway which could lead to using 100,000 tons of dry wood and forest residue for fuel, thus supplying about 30 percent of the plant?s energy requirements and decreasing its CO2 emissions by 150,000 tons a year. This is predicated on the assumption that wood is carbon neutral, that over time second-growth trees will sequester as much CO2 as is emitted by the fires that make the cement. It?s estimated that the process will take at least twenty years, but as noted before, so...