Chinese workers have erected a 15-story hotel billed as eco-friendly in just six days. The feat was accomplished using lightweight prefab sections and low-intensity materials that reduced the project's carbon footprint sixfold. However, what wasn't counted was the carbon footprint of making all the prefab and transporting it to the site. The hotel used a bit more than 94 pounds of concrete for each square meter of construction, compared to the Beijing Library that used 788 pounds for the same area.
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