It takes five times more energy to produce aluminum siding rather than wood siding. It takes three times more energy to extract and produce a concrete block than to produce its equivalent weight of wood. A steel frame building uses 4,000 times more coal, oil and natural gas to process than wood. Aluminum production results in 8 times the air emissions and 300 times the water emissions of lumber production. The production of concrete emits 2 to 3 times more carbon dioxide, carbon monoxide and hydrocarbons than the production of lumber.
Wood is the only readily renewable natural resource and it is increasing in reserves every year.
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