Concrete is among the most common building materials in the world, and it has a massive carbon footprint. The 15% of concrete that is cement is behind five to six percent of all man made CO2, producing nine kilograms of carbon dioxide for every ten kilograms of cement. A new solar process may put a big dent in those numbers.
Researchers at The George Washington University have developed a process called Solar Thermal Electrochemical Production (STEP) of CaO without CO2,reported Green Car Congress. As the name implies, it's a way to produce the lime that goes into cement without yielding CO2.
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