Carbon-negative concrete
Making cement releases carbon dioxide in the conversion of flimsy calcium carbonate to sturdy calcium oxide by roasting it.<p>Reversing the process by injecting carbon dioxide in curing cement is turning sturdy calcium oxide into flimsy calcium carbonate. Every pound of CO2 you sequester this way necessitates multiple pounds of CO2 released elsewhere to get that oxide to your construction site (production + transportation).<p>The economics and carbon footprint are similar to corn ethanol- attractive and green if you pay no attention to the total balance.<p>A corn belt politician I’d expect this from. IEEE should know better.