| http://www.w3.org/ns/prov#value | - He also certifies buildings for LEED.James Sala of the Southwest Regional Council of Carpenters said LEED's standard for sustainable wood products is so restrictive that it often forces builders to use other materials, such as steel or concrete, the mining of which entails its own environmental impacts.Ken Dunham, executive director of the Lumber Association of California and Nevada, said about 99
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