[Nateman]

Doing away with concrete as a construction input..

In order to make concrete co2 has to be baked out of one of the main ingredients. Up to 20% of man made CO2 comes from this. It's not something you'd figure a brain dead fool like Cortez would know so somebody who actually knows a bit of Chemistry must be advising her. Of course plants LOVE CO2 and have become so efficient at plucking it from the atmosphere that the vapor pressure from CO2 on Mars from CO2 is actually higher and Mars has very little of an atmosphere left! In other words REAL science shows this whole CO2 hysteria is nothing but a socialist scam for power.

[JoeFromSidney]

Its true that to make cement you bake the carbon dioxide out of calcium carbonate. That adds carbon dioxide to the Air. However, that's only half the story. When the cement sets, it draws carbon dioxide out of the air, forming calcium carbonate again. Net contribution of carbon dioxide to the air is zero.