I wouldn’t say there is 1 material that is less sustainable than the rest, but I can think of several elements of a house that are not renewable. These include the copper, stone, brick, sheet rock, plastic (pipes), and really any metal. All of these things are not grown, like say the wood that are your studs, so they cannot be replenished by growing more. Copper is very expensive, so is reused and recycled as much as possible, and bricks, stone, and sheet rock from from the ground. They cannot be made, but there is such abundance that it makes copper look scarce. I would have to lean towards the copper, and other metals that are found in our houses because they take so long to make, and are very difficult to extract and refine.
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