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answer architecture bamboo building california Cardinal central vacuum system concrete construction design energy Energy Efficiency Energy Efficient environment flooring furniture Global Green green green building Green Design Green Living Technologies Green Modern Kits green movement green roof green roofs green wall green walls home indoor air quality insulation interiors landscaping LED LEED lighting living wall paint passive solar Prefab question recycled materials recycling roof SIP SIPs slow Slow Home slow home architecture solar solar energy straw bales sustainability sustainable Timber Frame USGBC walls water water conservation west coast green zero energy