As you know, cement production is easily one of the most polluting industries known to man. The process itself releases huge amounts of carbon dioxide into our atmosphere, both in the heating of the raw materials and in the actual energy used to generate that heat.
In Popsci, there is a way to resolve this problem. In an article by Benjamin Phelan, Brent Constantz talks about how his company, Calera, is producing cement by capturing carbon in the exhaust fumes spewing out of a typical power plant and bonding this with the calcium present in seawater. In doing so, the process manages to remove carbon dioxide from the atmosphere and returning it back to Earth in the form of usable concrete.
You can read another article about the same story here.
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