I stopped reading here. The production of cement releases CO2 into the air, as limestone is calcined to produce calcium oxide. However, once the cement is made into concrete, it absorbs The same amount of CO2 as was release in its production. The net effect on the atmosphere is exactly zero. Granted, it may take months or even a few years for the absorption process to complete, but that doesn't alter the fact that the net CO2 addition to the atmosphere is zero.
And carbon dioxide it a trace gas these days and has been throughout the Holocene. All the sewers of all the cities on Earth, and all the hog farms in Iowa and North Carolina, put together can't compete with one volcano's blast of sulfur dioxide.
None of them can compare with the allegorical B.S. in this one ruinous article.
Which story will be parroted by your local newscast tonight. This one or the latest studies showing the solar cycles and the interplanetary magnetic field have apparently begun showing a weakening magnitude pattern, perhaps preceding a new Maunder Minimum and Little Ice Age?