Concrete proposals needed
Cement and carbon emissions | Concrete proposals needed | The Economist:
“Concrete proposals needed
Dec 19th 2007
The construction industry confronts its carbon footprint
FANS of cement like to point out that it is the most widely used substance on the planet after water. Unfortunately it is also one of the most polluting. The main ingredient in concrete, cement is made by heating limestone and clay until they fuse into a material called clinker, which is then ground up and mixed with various additives. Both the heating, which is normally fuelled by coal, and the chemical reaction it induces release large amounts of carbon dioxide, and so contribute to global warming. By the industry’s own admission, cement-making accounts for some 5% of the world’s emissions of greenhouse gases—twice the amount attributed to aviation.”
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Sustainable Construction, Sustainable Economy