This startup just raised millions to make cement more climate friendly
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Almost all construction requires cement, and cement is made using a process that releases carbon. Terra CO2 is replacing a key ingredient to make the process cleaner.
The billions of tons of cement made each year have an enormous carbon footprint: 8% of global emissions, or four times more than the airline industry. That’s both because of the energy used to make cement—a process that involves heating up crushed rocks to as much as 2,800 degrees Fahrenheit—and because limestone, the main material, also releases CO2 directly when it’s heated. (Limestone is made mostly from calcium carbonate, and breaks down into lime, used in cement, and carbon dioxide.)