For the walls surrounding the living room fireplace, Cobb specified high-volume fly ash concrete made with a by-product of burning coal in power plants that usually ends up in landfills.  Photo 5 of 5 in Yes, It Is Easy Being Green

Yes, It Is Easy Being Green

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For the walls surrounding the living room fireplace, Cobb specified high-volume fly ash concrete made with a by-product of burning coal in power plants that usually ends up in landfills.