Featured on Bloomberg West Researchers at Drexel University are trying to lower cement’s carbon footprint by using technology of the past to build sidewalks the future. It is the same technique that was used by the Greeks to build the Parthenon and the Egyptians for building the Great pyramids, so it make sense that it uses less energy. To make today's cement, you need a large mining operation, an intensive grinding operation and a huge kiln – fired up at 2700 degrees Farenheit. That’s a lot of energy and a lot of emissions. Drexel's method eliminates most of the mining and gets rid of the heat. They use limestone and leftover slag from steel mills to make a product with 10% of the emissions of normal cement. And this could have a big impact: China alone is using more than 1.5 gigatons every year of cement-- enough to make 2000 Pentagons.
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