Some current building codes that are not green focus on the use of natural materials in building systems. Adobe, for example, used for thousands of years as a sustainable building material, can often not be used as structural support alone, requiring the use of either steel or wood framing. The addition of these materials increases the carbon footprint of a building and increases pollution from harvest, manufacture, and transport of these materials. The codes are intended to keep people safe, but they also prevent people from utilizing natural building techniques due to the inability to regulate such a wide variety of methods on a large scale. Codes instead specify use of materials that can be more easily regulated and controlled.
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